Malicious PDF — malware analysis report

Static analysis result for SHA-256 de73844d5a41e8f4…

MALICIOUS

PDF

82.8 KB Created: 2021-08-19 12:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 21a622d2d3fe01f13ce9b82fd0b00d34 SHA-1: 32b008f7f5602fa9c092a26b8fa6b400e7922d38 SHA-256: de73844d5a41e8f438c6b6512c84e9a033703c81572e6b5367b513390b0e4345
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple compromised websites, many of which are WordPress installations hosting malicious PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary attack pattern involves luring users to these compromised sites via malicious links embedded within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e51cbce643---dupuke.pdf In PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/17886a11c588a536a4442709a5d3456e/kozowusavopogunivez.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bedc2e3517---15277492517.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/zalitojenop.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-8-14/20210814080240396220.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/pizuximolefolozirufugu.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828259cfd36---96907043850.pdfIn PDF document text
    • http://unsersohn.ch/images/file/rudifowilutazuberixaro.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/rutovikumugaxabaza.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/natifegamugenesigimoleba.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102fd80034e2---kijexitomekot.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/39f7e8e4db54e0f89f82520676bda33c/bivezilegenofuwufuwarurap.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608692a9b02da---venex.pdfIn PDF document text
    • http://iucecb.com/files/file/jeloworipewe.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/ju5c0uc70u23tqppoq16oplh82/74007152181.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/80892ae45f47154d833ce9272d426ceb/4831530474.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/17m8vqevbi50hhde6fkji8mvsn/59608861292.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/26096523378.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f119389bf---14729607870.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a41431ea469---wetekuwix.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/rosusevifozararoziwag.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/zivavemelekikimijibini.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/51614499714.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/6b7b87vsqffguuasii8gdb47vn/96895575070.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeacf65c30---xalipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+disassemble+bissell+little+green+machinePDF 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_off0000df33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF33 11032 bytes
SHA-256: f38e869d34a96cc449fcabbc5aeada44e6fcdafe157ffd6d484c44aaa90fe303
font_01_sfnt_off0000f879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF879 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001108b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108B 17044 bytes
SHA-256: 53686187d97f41ae2c47edbe8b91ddc5b5d98e0489f749e6e6a7059256e94393

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