Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b72512ec77c7db…

MALICIOUS

PDF

88.7 KB Created: 2021-07-25 11:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 15ec0bd02e1784944767d5c6ed6cf9f4 SHA-1: d9b8300e1f17ae13593be4b805c4c4a71e3fa3c8 SHA-256: a2b72512ec77c7db7e8c34e181ed095929e7f5fe855b27c52eaaecc45c1b05bb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://miskolciharsona.hu/pictures/file/kikefujorojigawalugale.pdf In PDF document text
    • http://austria-ex.com/images/blog//file/bugagepepegi.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16082ff01200b6---gabamom.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/363989270.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/27691726538.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/37990820218.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daaf5d3ea05---37224654194.pdfIn PDF document text
    • https://securitydm.com/slicice/file/34750063335.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/nukud.pdfIn PDF document text
    • http://yljx.cn/images/upload/File/40414044781.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/kabufikevotifowonel.pdfIn PDF document text
    • http://synergyproperty.com/images/files/10250372974.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/imk10isf00nv2mgf31l15uipeo/91713024001.pdfIn PDF document text
    • http://ashokarefrigeration.com/userfiles/file/48694961887.pdfIn PDF document text
    • http://momsystem.ru/public/file/tanen.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/vetunanekadulavagiwamab.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/49064987010.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/vuronalujadonagunukisovu.pdfIn PDF document text
    • http://0930actress.com/files/files/xototatuvumikedisugodu.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202153012360644.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609eff2b522aa---jolanedizaluzezob.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/45873590812.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/85673706919.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+a+bill+of+sale+ontarioPDF 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_off0000f2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F6 19624 bytes
SHA-256: dc1815804003e61f7b07be0f4b76a4a8e8b56326d70a8bf9584f17bb439eb77b
font_01_sfnt_off00012516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12516 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D2D 10444 bytes
SHA-256: ed7e7c3072746049d2b0f6d4ac720202152f25b159c0baac0173dad5f7b8dc3f