Malicious PDF — malware analysis report

Static analysis result for SHA-256 11719cf3199489f8…

MALICIOUS

PDF

131.9 KB Created: 2021-07-13 03:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ac5e4508383fe645d1c6f23815a86734 SHA-1: 80ba54afd613138844fb37ab41044bd68bb930d2 SHA-256: 11719cf3199489f8ae0fc41e990e4573b5d23bbda8ea96f9d61c3c323d9b4027
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9713

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 http://dges.in/userfiles/file/wasubuwifor.pdf In PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac11674af88---pezorepanetugovorozup.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021052319380429.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/b70db2df3eb0fb7787688bcf70513d24/49264914041.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9905c5dd8---82854288259.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/xarovupu.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eda3396c34---viguporufosetilim.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b72592d20c---volexavoripezebejitexix.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/14270304905.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5d7eb8d3c---nodetokomujefixubekebepej.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca84b06c87---80323675084.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/f1d59b0b1676dc9f90c6cbc535966419/furujosabekazijez.pdfIn PDF document text
    • http://mosjob.ru/images/file/gazomufupizebolu.pdfIn PDF document text
    • http://4bx.pl/public/file/womisiti.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/bubabanexixamaridajurito.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/nc7844mg6iv01po971k3nnfbg4/sapukasatakosabixobir.pdfIn PDF document text
    • http://babamoleskine.com/files/file/48009835532.pdfIn PDF document text
    • http://gloria-eurex.com/82406117221.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d186bb04767---sokavininadogesaxin.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/41378076809.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/667snvnt0igvnbrb5chm8h1j4r/nupafogixogujo.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8fdaf046254e40b5ca8f4ef5d94f9c3a/2970547000.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/43004325723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=19th+letter+of+the+alphabetPDF 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_off00015e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E74 1804 bytes
SHA-256: 6513ac46128a5f3f81cbdd1bc82d78e01189afc0e0d3a2e4527474bf08a5d152
font_01_sfnt_off000166f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166F2 10356 bytes
SHA-256: ba5aee9d9dfd4d826afb643c0e96acfdec29ad4fb644d9ed1e5f9cede0a50307
font_02_sfnt_off00017e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E44 35960 bytes
SHA-256: 1eb64689f360a44e2e53da22dee659e43b675c04650da80c3ac6026b4fa26b92
font_03_sfnt_off0001ce71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001e682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E682 17756 bytes
SHA-256: 94f4a6d02dde59ad4a4866a0fc8a252721891d2a460da7fe392ec3e609b62416

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