Malicious PDF — malware analysis report

Static analysis result for SHA-256 378c8cac3f1e2010…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 05:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c504a4c2281ad78af728ee7129c89f4b SHA-1: 175f2273aaa894167655ecfdd33deabf3c83ff8b SHA-256: 378c8cac3f1e2010d711a3a1fc4f807c1b90aa17f84788a96013856ae8eafbbf
212 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and presents a social engineering lure with a visual download button, instructing the user to execute a command. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a second-stage payload. The presence of numerous links to compromised CMS upload storage and disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://aaronandanthony.com/userfiles/files/62845667102.pdf In PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/106a330da6811c5058a5cbc955d4c1fe/laretilafitavora.pdfIn PDF document text
    • https://spacio.hk/attachment/file/zimuvonabofupunoba.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3465365440.pdfIn PDF document text
    • http://potlista.com/file/files/libopirumubef.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/32711244840.pdfIn PDF document text
    • https://hoongnau.com/upload/files/soriw.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/41688722932.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/tirozal.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/9c3c0622a54f66c25802753395cd0669/gigesenafetilipir.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/pozunuvegumejenuton.pdfIn PDF document text
    • https://jotelek.hu/files/file/7433343201.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/43733492712.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/40419125628.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0573d36bc---12178246779.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/26650094231.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/sigibikodapuvojewilepez.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138c87110203---lijipizokofedefisikusi.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/42773924286.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///mixaparilavov.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/pufewuretejigepoda.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/22619722148.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/rizakedofalalumosol.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/wemelewomarinatiwe.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/788711fbcb63da2c6c2902413265c108/pilozobege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=w7+to+w10+upgradePDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/48910339442.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_off0000d73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73B 17824 bytes
SHA-256: bb5a3964bed7c21b141f66421bd18c370ce83b056afd80fd94bf427d54e77aad
font_01_sfnt_off00010557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10557 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6E 10560 bytes
SHA-256: 9ad60efa4f5afc0f680367dc54e75e74142989d9b95e07e47a4d2395a68d7768

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