Malicious PDF — malware analysis report

Static analysis result for SHA-256 c32647174e6064b1…

MALICIOUS

PDF

94.0 KB Created: 2021-09-04 05:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 180a9469c99d5eef0135fb268a259594 SHA-1: 344b3c6cf361c83a57754b6c1a9d781ae43c397e SHA-256: c32647174e6064b1996477a1e03a8b6bc876a117606c6cbffd4d83b08beb52a3
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://coretry.ru/uplcv?utm_term=fundamentals+of+islamic+finance+and+banking+syeda+fahmida+habib+pdf PDF link annotation
    • https://jin-ji.com/upload/files/napakijenekudubot.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/kujuxigowokagezipenu.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/76063176981.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/46796316468.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/wakoxesero.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/b78ce3s05htee3v1nou9egdl2u/jusitedadopulerafejexini.pdfIn PDF document text
    • http://www.moyekolodin.com/files/tiseworofevazag.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b181b37561a---pukuwelemezisoniwepefiwod.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/3877733942.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/ad5fc49e90336edff6d4b31f8fb66d43/23870764309.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/f412a454a0a9b999c756a44e91af00d2/60825670753.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/toxofulagezikebisa.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/sexafarij.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/60528849699.pdfIn PDF document text
    • http://flirdining.com/uploads/files/wunanuxibenasafosakakuzo.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents//files/mokituraxowawavil.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/26865562745.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d50c40f552---lowigibote.pdfIn PDF document text
    • https://saam.vn/images/content/file/vopew.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/1l2fn6jvi5bhcaa0laiv4sda03/wuliwefe.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861ba01743d---13362883609.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/d8139b815d1e5783faf3207bc590f123/58480484995.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10418 19972 bytes
SHA-256: 4146c308cbefd3d615cb403dbcd41c2ba01619dc8f27ad6602d41e5330c1acb6
font_01_sfnt_off00013750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13750 11392 bytes
SHA-256: 903d5eeb918cbfca8a835780bc59abeb472955f2ded5933d8dbc5982ec399c3d
font_02_sfnt_off00015196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15196 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1