Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a80f122ad29130…

MALICIOUS

PDF

89.7 KB Created: 2021-07-03 11:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b4cbd5327127def4cc88881a8135e323 SHA-1: f0a136889ff6a4415fe233923b7352a79f91a5bd SHA-256: 26a80f122ad291306617b308d3778e0ba4d8d54909b0f33f7b9ca9c0494f1c29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the 'super-forms' plugin. These links are likely intended to lure users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=aladdin+quotes+about+life PDF link annotation
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/vtueedm6es383b9ei1bca47qmc/fajedekejafisakozogin.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/hqdl08l82pjhrs7vbqekakv9is/27299801551.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/zivaligedizekaz.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/n5gst141eimrga5d9u2qu6v43a/61229446229.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/sokdjp2filqmfoncl2er5u5oos/fixorixurubizotesil.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/4e5d5ef9bfc0181b6cb14a37340d996f/61267043945.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/54026657580.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/savozuvazepasod.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/33026467909.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/81766491.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1ed9308df---93833342984.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a180f4d8---1619221311.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c9a73a113---86480345855.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/5300325145.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/37570524209.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/da01012c02f2f6d5eafc4e0582956b0f/60231224804.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/am2i0p0b63n69fimh53ga2qqqb/folope.pdfIn PDF document text
    • https://aspirans.com/files/file/bisapeliwaribikefo.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/ouqqmog2acc3nftivoc16dkl21/vakeredale.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/0ac7d95adfd7da9660dbb7c0e0b6de2a/25171795032.pdfIn PDF document text
    • http://df-2.de/images/daten/file/8848458114.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/xojadi.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841b2fa29ab---kinozopasotuvabu.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902901957b5---xotub.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9ba0cb0ce---wojabekorajazuzi.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_off0000fa66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA66 17848 bytes
SHA-256: b1138d2b282a230aef6e62a7ba6718bb6d15435fa01118504fffb092c10da200
font_01_sfnt_off00012913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001412a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1412A 10616 bytes
SHA-256: 368bdbfe13c2c8dc15769f22f669038896f61b240a5267148dd11b2856cac837