Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f01aff2b6c38189…

MALICIOUS

PDF

76.2 KB Created: 2021-09-03 21:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e3567ff403bbb02a18abebd2208901e8 SHA-1: 83f90d617fc0ad1763602d4c8eff822cc84aaea2 SHA-256: 9f01aff2b6c38189b003128ae26ba255226f22b8d7beba256a333365b048c600
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs hosted on various domains, many of which appear to be compromised or disposable. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggests the PDF's primary purpose is to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://wastran.ru/uplcv?utm_term=pigeon+hole+theory+pdf PDF link annotation
    • http://seyrimerdin.com/userfiles/file/bowokun.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/xamiboxupadugabenesesanob.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210608101253_g5o68c.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/guvexapixide.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/54529012385.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/19d4db3e457f2ca008a0fb96c7704d05/7868272779.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/zesusozibe.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/8395624640.pdfIn PDF document text
    • https://akvaguru.hu/user/file/lulabuwimomalevinobe.pdfIn PDF document text
    • http://ternovykh.ru/content/file/wesirijulizofuworunumuga.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be060c97a2---30444011259.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/38917463966.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/51975846710.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608637935875c---wobigodorijuziv.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/patanewudik.pdfIn PDF document text
    • http://ypdtools.com/ckfinder/images_store/files/papenis.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc295e297b---bamonikorek.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/64321480654.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070829cc2fd1---sifoduxokokekama.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/79249840175.pdfIn PDF document text
    • http://texmet.pl/userimages/file/gozemebogo.pdfIn PDF document text
    • http://asfalon.com/__files/file/tomiwimaziw.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_off0000c476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC476 10564 bytes
SHA-256: 82d18cde34bd7231a0cbec0615e421c4426c777e4a55867267506d83d03a1d42
font_01_sfnt_off0000dc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44F 18104 bytes
SHA-256: 3d323df0737b7c7ddfcc55b3f2ddf8fc4d77d1f0804b548ef1182e2b165e0220

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