Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b05eec1cc9f87ac…

MALICIOUS

PDF

98.5 KB Created: 2021-07-28 07:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: b1a9667316d2f4e5281bf74d95d9a2ec SHA-1: 9be39dfaa9f5d712986bea914b420a7ae74bea89 SHA-256: 3b05eec1cc9f87ac854cbe0af8c5af0713950b4ba8c6d5598f45348dda9871db
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains numerous links to external files, many of which are hosted on compromised websites using vulnerable plugins. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or phishing content. The presence of a 'download button' lure and urgency language further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97092d2b9f---nositujofelewixam.pdf In PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a834df920d8---mevur.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/xuwaguz.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/95828955003.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/2s07t43uuljn1saj2sg06outlr/53041889741.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/200a78e7499c1c22f16c0756741839cd/naronagezugosa.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/9004db198ea90f51f503fb8c963de8d0/nisoginitupekalijaju.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/27af07d8358cf45a596c76ef2274c39e/lupulodifekowazapawi.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/h1qsdp3qim7mm8nb0446db2l88/nugesiruseradil.pdfIn PDF document text
    • http://geose.ru/userfiles/file/91386141457.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd0a1b0346---dosomalipo.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/80710521489.pdfIn PDF document text
    • https://metal-et-verre.ch/ckfinder/userfiles/files/vulowemirabofes.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/499c42dd988648c40c6690f7fbc3eedb/35186300805.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/2768828252.pdfIn PDF document text
    • http://aimic.com/userfiles/file/letos.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/85591550821.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093a107490a0---44703862308.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/pufolozabilukimokugelunu.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1339be14b---mixogelesugejiwemute.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29804569603.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/1fcb0069123f25335d0f338484b046dd/29233147316.pdfIn PDF document text
    • http://lyshiying.com/d/files/93290236028.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba709a80632---85562605614.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/73036565518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=amc+security+pro+key+2021PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB43 10804 bytes
SHA-256: c8b41946d9bb010cc04c20d1b40bea46cbfeadc2b4626e52e00fb81a14fbfd8c
font_01_sfnt_off00011454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11454 2064 bytes
SHA-256: 5221cc56e96b657ff7c15f49bf1fbf1b5222e15cd7ffd769ce953162a3e53832
font_02_sfnt_off00011d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000135a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A5 17956 bytes
SHA-256: 57323e93b870e95b0bedecdceda82deb337f6dffcfee203d8cc08bd1f3335015
font_04_sfnt_off000164c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164C9 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd