Malicious PDF — malware analysis report

Static analysis result for SHA-256 617b4cac7074542e…

MALICIOUS

PDF

87.0 KB Created: 2021-07-23 03:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 87f7cc45fe7c5ed6ee6341d93db42899 SHA-1: fff3180f03bbf0380367885cc2c5da8040339ec9 SHA-256: 617b4cac7074542ee93a2adc41077ebb1d93c01117525cced547493f3832fe4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/63116097993.pdf In PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/7941537853.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082f0aab1185---jupuwowugamowubaf.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210611_2AE1A8D7D158BE3C.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607172182b642---worapiwabezenigaberu.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/wisuzugilemumifaviripis.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ab319643c---7426593466.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/03580fe0b4e73c0f8695b72a1012400a/94748858765.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/tijusel.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/63014884088.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/gunixidufuvinovilifikax.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/49c79d7929b00273a9564e083bb529e4/43789484198.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/75682079092.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/70677908909.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5394e54ad1---rilatojo.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796c3eb663d---92419693548.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/638731828.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff35480287---41855158320.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/92062391978.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/61178988545.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/5da76589af4a9c11ef281ae3ba3f1a9a/46947647131.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/699bf63e8ce84e2026203c2b631f46ef/vazevaromu.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/jovutababigawilusikem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=list+the+first+5+multiples+of+2PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFF 17172 bytes
SHA-256: 90cb6854b0dfd830d98582d9d6f64711b05525256a1cfe52fa0c6f4758099333
font_01_sfnt_off00011d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001352a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352A 10668 bytes
SHA-256: 19c3856c7e1a4f464b66e9dbbafc3b32a44d71ffac029d211778d4efbaa2da85

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