Malicious PDF — malware analysis report

Static analysis result for SHA-256 51570f932b821bab…

MALICIOUS

PDF

86.5 KB Created: 2021-07-25 06:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f2685367aed1ce9f4b2fa836423bb52f SHA-1: ba5ff38b51d63f7277474387a4c037965aa19bd0 SHA-256: 51570f932b821bab5a1a9138163b1ac1af0c8e667a2604018c102d0b6a6ebb2e
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDFs hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. The embedded URLs are likely part of a campaign to lure victims 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 http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607807e9815f0---31073597964.pdf
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60619177091.pdf
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/48682393386.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/b3creldo32o3lk7m0hck9ktdfe/52878372473.pdf
    • http://thehigh86.com/clients/13680/File/79350214941.pdf
    • http://jpbullies.com/clients/2/2c/2c827f09d77a589c2c5c7da8c033a3f4/File/mofudakulovugijuverozada.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/bf1boeq82idopd9bsq8btg5p11/79439841883.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/9f1ae3f5cac2f233dbf7b3fd3f744753/24799126841.pdf
    • https://actorconseil.com/files/file/43103568252.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/8b4954328b7f47c3a5a79d4bf6a26205/dajodijazilosa.pdf
    • http://gongotour.com/FileData/ckfinder/files/20210619_91599F52833A2AB7.pdf
    • http://sb-78.ru/files/file/24826925913.pdf
    • http://classicalgardenstatues.com/uplds/file/74797191544.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/e6da4204cf7fddf0499689d57d808dc2/vorakigi.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/2c21b5a643404f3538f0b9ee7467f0a7/23396593380.pdf
    • http://armanetti.com/images/59881935537.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a26d7c65c---16465971454.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160af0d6cd7202---87531437095.pdf
    • http://csss77.com/clients/d/df/df7f2fdc42e243c7a03c192a8228c0be/File/wubaxoregija.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608499e8e8b85---dedigexokadamorunefam.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aef0168e11b---76828175305.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/aed0bb5f17aa664d6c501ce2d5055e9c/besubupoduz.pdf
    • http://adance0112.com/upfile/editor/file/sikuwesupevu.pdf
    • http://fashioneducation.ru/userfiles/file/buvedulixim.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=mobile+suit+gundam+extreme+vs.+maxiboost+on+ps4
    • 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_off0000eb9f.bin
0e51201dafdd2ade94f7900c55b08b62a9cf16c497e2504fcd59e15978d568cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9F 17576 bytes
font_01_sfnt_off0001171e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1171E 16792 bytes
font_02_sfnt_off00012f35.bin
56f190db181cfb3ec202f9d1a2b62d3c28a76673c748e988828f274e16182f08
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F35 11280 bytes