Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85a321070a98809…

MALICIOUS

PDF

89.9 KB Created: 2021-08-26 06:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7ee7a660de1c7a4160e411801c351496 SHA-1: d402af32367baca8ee1d4f5836f23b6381ab6b20 SHA-256: d85a321070a988091fa41a03d2c1879a60382f859f3b4f3d5daadd28b435a949
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nomylo.ru/uplcv?utm_term=my+cover+is+blown PDF link annotation
    • http://art-ball.net/files/file/68715828739.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b330038bd3d---3191047015.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/78975528032.pdfIn PDF document text
    • https://highrise.pl/file/65027445783.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/46444623574.pdfIn PDF document text
    • http://unibox.lv/files/text/givekunoxerukojabibux.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96573ac60e---gulifonorogudisebuxigoz.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/11328159045.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/9130834112.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/zamuko.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/sibumuxazabanimix.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/1353428428.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a93593cd6---70868239093.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/duvaju.pdfIn PDF document text
    • http://519pf.com/userfiles/files/fazebiwesapogusa.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/4422dd1ed60385cd1cc64f0982d58f8b/38532641895.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/wofomajej.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/50427953148.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/73737944849.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/46d52423a7a85b5bf2b97ea5b54071f1/51716585220.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e24c1c0e1---72619014345.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/4k72ed7piqmlma8t8icl7sm1n9/28106686922.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/rijawuwujoli.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF261 18532 bytes
SHA-256: f0fdf7859859e50671476aa02c27dc7cf809a4d4e492445df461e11f180dd931
font_02_sfnt_off0001218d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218D 16504 bytes
SHA-256: 115b418de671664b2b2389805d710068f6007e4508dd5a97e03637cda0987e5d
font_03_sfnt_off00013882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13882 10360 bytes
SHA-256: 10c6650b2b25037ab36335a86dd366b1dd6c7c53377d897ff840bcf13ae20218
font_04_sfnt_off0001500e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1500E 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560