Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d7d692d6bc54596…

MALICIOUS

PDF

92.7 KB Created: 2021-07-25 03:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 85158ad2cdfd948c62067fca3e16fd74 SHA-1: ad48171f3a00c9404d73239d99fb479ee1e8b051 SHA-256: 4d7d692d6bc54596a6310277c97f0d51378f1571fba613d05244c31c2c986738
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. The presence of external URIs and link farms indicates an attempt to direct users away from the document, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f6e682b031f---japokajokuli.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/moruxesoki.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b87c47e01af---29371449108.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160f6bae6e9da9---34122675007.pdf
    • https://santevita-bg.com/ckfinder/userfiles/files/19946141166.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/a36f5e6ee34662fcb517e359975c5b5b/16474380718.pdf
    • http://haiphongcontest.com/images/files/54494343796.pdf
    • http://www.physedu.in/newsite/userfiles/files/xenisutarazimikupiw.pdf
    • https://bandotrading.com/uploads/file/19774032867.pdf
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/koguju.pdf
    • http://jinxinghotel.com/uploads/files/80372544020.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609628298b0e1---31086718716.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89881544d5---69246189388.pdf
    • http://akcjonariusz.com/UserFiles/file/33535477735.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb605ea381---31270302625.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e68beac6f0---revejekumokifefafufejid.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c8e4d49c3---70264899385.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/18f957624663555e7cc869b7238a25fd/87474725045.pdf
    • https://aquarell.ro/userfiles/file/38648852329.pdf
    • https://amd-export.com/site/upload/file/77786170309.pdf
    • http://falconfam.com/ckfinder/userfiles/files/linejiket.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/ol5ls9u6j8aksqc25oho7hrv98/15415423686.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16086fbcc2740a---dulofuxewi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=cursive+writing+tutorial+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_off000103fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103FD 16792 bytes
font_01_sfnt_off00011c14.bin
b34989e72cc7d2777411576af3afada5721d3650a5d8559363ba194ff91bb0e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C14 10956 bytes
font_02_sfnt_off00013585.bin
7cea27c70036525d36283dcb6f0589e92a9281548715a4fd39504a0ca8897b3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13585 17960 bytes