Malicious PDF — malware analysis report

Static analysis result for SHA-256 892f96a151f0cf23…

MALICIOUS

PDF

76.6 KB Created: 2021-09-19 08:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9f87da5ba9ef6ef09231b4677ecda9f1 SHA-1: 4163788af79265196bd9e18c6ed8fa7b0ed7a2e4 SHA-256: 892f96a151f0cf2388677d28a7255471b57f8af7f60fe43ee7ecd03db9a6eac0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The numerous embedded URLs point to compromised websites, suggesting a link farm designed to redirect users to malicious content, potentially disguised as software or documents. The presence of external URI heuristics and link farm indicators strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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=power+director+pro+apk PDF link annotation
    • https://austarpharma.com/upload/files/55212912716.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/kojajopuxiwowuvapisetabak.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434007b2b8f---41690064696.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/nisimaneruzabekamusedeget.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/63288390092.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161448e969f1b7---12308069990.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/tavezajusavizaluzi.pdfIn PDF document text
    • http://baove247.org/upload/files/vujigakid.pdfIn PDF document text
    • http://snft.ro/media/file/16369056931.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/nasuvas.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/84388816631.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/52976140851.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/7371348797.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/getokixonuvejuviz.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/wipuwizigev.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/korabuweluvafo.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/bilemigexa.pdfIn PDF document text
    • http://air-ned.com/uploads/files/zawopiretas.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/80368990254.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/59461112951.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/zixupimugemewa.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/denup.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/94626380769.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/luvog.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a706339f2c---viguredo.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_off0000cd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD03 15736 bytes
SHA-256: fbdd3ed7058c3bafa390646f5a8a0cbf2235916801e5cde320ea71cdb0e899bd
font_01_sfnt_off0000f557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF557 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6E 10368 bytes
SHA-256: 05672bd789ba4f433d7273ccc0f2991f6cafcf9411c95f12a0fd2e15a66b494f

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