Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d32cf885d360f8…

MALICIOUS

PDF

83.9 KB Created: 2021-09-02 20:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 74865f12c8b4f27def7b41ccaaaa878e SHA-1: 3a5fdf09bc0d3f1df30508bc23e076ec2bf8a5fb SHA-256: 75d32cf885d360f8cc6e2afb8cc01a7c46257044632a85acb7e2196ab388b441
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733b2472587---tosadelusababitunoxi.pdf In PDF document text
    • http://jshtextile.com/UserFiles/file///77846150087.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5c8cd57a3e---viketogabimotuf.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160fe8571a1222---fezosojalufetoretipuzomer.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/54578387234.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/b606287cf1b9552d90ac7913617ad8b7/bujeratajaxijadisit.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/24420226849.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/radazesivirenelebelenivij.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e0d809fe1---21136536459.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/famowox.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/68504241692.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/eektbhoe5i5hqtpu8qs2sdaro1/83324341312.pdfIn PDF document text
    • https://grandegroup.net/files/40360252711.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/72716543460.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/24096766041.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/teguwutonuzunaruxodes.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e20e43194a---86923051737.pdfIn PDF document text
    • http://elm3rad.com/file/8933092991.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/jisazaturobebojiboz.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b783a71a---disuzuf.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/e78a9202495374d9f2ca59a945399b90/61066233125.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/50435975459.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=prefix+and+suffix+root+words+worksheetsPDF 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
stream_005_off000114ae.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x114AE 17520 bytes
SHA-256: 5350bba3d404ab0d4f3f83382945b08c8f5de4e0dd67de6ee635f3db36fa8b24
font_00_sfnt_off0000e3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BA 10788 bytes
SHA-256: c2a039d058522c6e44039777c7763c10cfceeb13ce9c1bbf603b06cd352d3760
font_01_sfnt_off0000fc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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