Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c16415cc2bcd28d…

MALICIOUS

PDF

77.9 KB Created: 2021-07-03 12:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c6bd49053b3c5ceb023a871b19b38c2 SHA-1: 818092e5e28a7cf55527785bd2e6d2c1a05ee191 SHA-256: 4c16415cc2bcd28dc0be07a206b081c746df21517e2ba9a1028b3216346ec765
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, characteristic of a link farm designed to distribute malicious content or phish users. No scripts were extracted, but the presence of a link farm is sufficient evidence of a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/2149e474c0cd2f257bb9cf0e47234177/virigupob.pdf
    • https://didacostruzioni.it/userfiles/file/roruli.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074809c40529---jutalutixubetowezu.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/6efm0bba4ojcep3v4qedr3vkfa/fazugoni.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4bb72040cec952934f2ad2d05adeaa97/wopenalox.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160802f44b8255---14386938607.pdf
    • https://olterus.net/contents//files/nenefotizezoxoma.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d60e1502a4---88495146172.pdf
    • http://asijskepotraviny.cz/files/file/sifukifusojibi.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774217c7eae---magesemimaronomu.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf748bf3c81---72407462370.pdf
    • http://jikaramen.com/uploads/files/88135755376.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf5f1bd277---50748013954.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/th91lmtp4pd151s8qk7iujdp36/75723834.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/kufepiwetinanikagum.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16094178192989---xisarikotelejedi.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/4855e5d7ae61f7dfded8e440a75b59d7/nakifoxurosebugakalinod.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/d075e75ff9bda7becfed3d8757c842b3/93416115727.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/13948924777.pdf
    • http://candientuvibra.com/images/file/gubewiti.pdf
    • https://condominiovillage.com/userfiles/file/sitixasekazupisetu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=12+minute+stopwatch
    • 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_off0000cf2d.bin
5ca9656bfc1a906a24fd01b1a4e640a72dfb6b573e4f7cb41170053c83e0cb4f
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2D 16800 bytes
font_01_sfnt_off0000fa35.bin
a359ca4b44791a6e4c719a7ff92362cb2f88d20d7535e7eea8af98b9e7622e26
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA35 10752 bytes
font_02_sfnt_off000112e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x112E6 16792 bytes