Malicious PDF — malware analysis report

Static analysis result for SHA-256 6480972e19794129…

MALICIOUS

PDF

203.1 KB Created: 2021-07-06 23:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 54118fa5dd8e42c9f4739d8bd2a09c22 SHA-1: 1e59a56483b4fc738008ef373e5c9a7c13d5a561 SHA-256: 6480972e19794129276aa8adc52093e07ff229fd902386939d47c985608c10d6
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it uses a link farm pointing to compromised CMS upload storage, specifically WordPress, to host a PDF payload. The presence of an SEO redirector lure suggests a phishing campaign aimed at tricking users into downloading the malicious document. No scripts were extracted, but the overall pattern points to a phishing lure for a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8a8b61b73---befararimibiw.pdf In PDF document text
    • http://angarakshaksecurity.com/userfiles/file/81002496501.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/gawijem.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d8872a6f1---84654357468.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086b7d93dc58---mezifexinuvaserur.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160818f0002ae9---45730471678.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210605_5291480175D120BE.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/b98d7f1bb273ccbb6e8bf3276abfccf7/33682970426.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/mu35o2k2dtnangr2k5q2neid97/xoderepaxivetevasexojomem.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/bctjeg9ue7hqtasdq93kv0afv0/61593146499.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/a39d42093cfc67df27bccfdaf04807a2/16740068068.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bf99c8adb7d---91975199166.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddcc1808bc---14825562966.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/44666158549.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/866ff47692964c723e4f112209d583d3/82751939820.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/3be51bb6662c9d95361fcdbdbd077837/tatelezi.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/0fe1a68dee42e6534e055ad9956237b2/85372552778.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/54c0e74d783ed00d8bcce236808216d7/87177636479.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/985ee923addeb34cd8c95a51ff0184d4/vimupemiw.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/aa1513b4325b5f15c8fd1e2994f4279e/lifomuwuzilekijasevol.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/77832614384.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/givexuvasobudinuzuju.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/iv7fu2igm7nl26idt7pgibpac4/nunesezoduvabolobe.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/65030644082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=meaning+of+atheist+in+tamilPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002b6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B6B2 22684 bytes
SHA-256: a2894cb655236bb01b4e43aed2c3d451c0fbeb7443e2e26174e4da41decfe4dd
font_01_sfnt_off0002ee69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EE69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00030680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30680 10552 bytes
SHA-256: ca92951bc265a6cf2f511386fb81c477237e09e9a5214aa9b54915f374e5fd5e