Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f5c15781f265357…

MALICIOUS

PDF

85.5 KB Created: 2021-06-26 15:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dec630be82734d35ee7092b3e3b87015 SHA-1: f73da34db7415b3167cf197bb5aae27392bdf0d3 SHA-256: 6f5c15781f265357b67c9bda779da5dcee4c4705e546882dae7ed90b3c6b958d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be social engineering via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16099db00b4d29---rurozanimufuv.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/4db3f4a7c16fe98e368a6bfcdb749239/11709964583.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1609029b938319---xadidafezasalifo.pdf
    • http://hit-air.pro/ckfinder/userfiles/files/finodasowukabes.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/7c43354f1a5e3f0165502109530f4c2e/7332664752.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607be737085cf---vexojaxilala.pdf
    • http://dnepropress.net/files/file/16601149288.pdf
    • http://ksnjl.com/userfiles/files/tajagugisosexosexo.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/28a92c2290aaa9f7a22799f9b5ca2743/24008667382.pdf
    • http://sarljarry.fr/userfiles/file/wupebabomamorodaw.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089f09735707---97218289898.pdf
    • https://paklya.su/design/img/upload/file/88707368324.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ece516f7b---47391995732.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822be7ad5af---gilanubarowejas.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/f7787cb3d2cbdbf494968df852ef64a1/93066222137.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e40522b34f---xomuwigowewif.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc7561a78d---15403424779.pdf
    • http://euro520.net/userfiles/file/16244862621020018367.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/50246c1d7ddf8b4e9782153ae6b0145e/gugedezufisamimidej.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/g2gqqrlp8oilsqfnbakk05im2r/39575340333.pdf
    • https://kristinanamaste.eu/files/xevudu.pdf
    • http://asokmontridental.com/userfiles/file/gusirugomefunuvod.pdf
    • http://seanmore.com/userData/board/file/vafolifemosakepelaw.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d580625862---85303175393.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=why+do+my+ears+crackle+everytime+i+swallow
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/629718e0257398c32006f814e659a1df/puzaga.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecdc.bin
f57c88d29c799f0ef66e2494ee5ea0d31711be0ae44eaf736c3564e7705fda69
pdf-font-stream PDF embedded font (sfnt) at offset 0xECDC 16352 bytes
font_01_sfnt_off00011729.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11729 16792 bytes
font_02_sfnt_off00012f40.bin
182b995b29b70b4433e7e8672a9b18a1589352650cb6ca40d99b6db94acd0bd0
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F40 10880 bytes