Malicious PDF — malware analysis report

Static analysis result for SHA-256 3372e5152407f6c2…

MALICIOUS

PDF

72.8 KB Created: 2021-06-30 01:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e8c46c38c1ba870e662e2a14571e19e SHA-1: 442c47d2eb2682088131bad1b3ad6f37893055c0 SHA-256: 3372e5152407f6c285e9bbeee020beede32d943996f2faafb1cda58e32a489ff
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, designed to lure users into clicking and downloading further malicious content. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to manipulate search engine results or track campaign effectiveness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://okmarin.ru/userfiles/file/68078671446.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16093b3935bed0---83999786867.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/s6i4r6tcprat3ut06vr7oidiqo/56705737949.pdf
    • http://akinmedikal.com/uploads/file/dodufajexuwimavoboxipa.pdf
    • http://amghanoi.com/images/ckeditor/files/gufatu.pdf
    • http://lovesushiscv.com/uploads/files/wopevumaburafivojewut.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/f0mkq2s259ltahdeutpbe9v13t/29220860342.pdf
    • https://signika.pl/Upload/file/98623571730.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609858ac9690c---ditoduvedunabudinopuz.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/7ae8a8e4f4396fc02fa9200a2b5963c6/lutivofu.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/b336ccafb42179168b97a6a3aeea4e79/25621547737.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ae7925312---junojitexedajibekum.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/93537067912.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c674235fcf1---sidutufujixefunizove.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/8debd7326859afe5c1d72564b597cc57/32886650713.pdf
    • https://abofahed.com/userfiles/file/falutukarekamik.pdf
    • http://nwatchonline.org/userfiles/file/31857646380.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/0cf0d5c22064d8e40c68c502c93725c7/61723790783.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607540f12cda7---xutobaden.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/nod8je0tq4keo7gi3ik3uvff17/52280388807.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-4-29/20210429075028815974.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/jblf695inin234emlrrfhjq3b1/vemedajuruvumakisajavumap.pdf
    • https://bruceautoservice.com/files/file/62635070882.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c151f77a585---54920142063.pdf
    • http://gospelinamerica.com/clients/874377/File/77148568281.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/19d4db3e457f2ca008a0fb96c7704d05/7868272779.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=1+dinar+to+aed
    • 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_off0000bfb8.bin
1f2464cb3e5abf4e2c71a6e6e5368287b901686504f878db24499d3d45d0e921
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB8 15516 bytes
font_01_sfnt_off0000e7a9.bin
2638716c97d260f070d29b8d9a0deb371cc57b14b256e9c6880c0fe7109cecf7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A9 9980 bytes
font_02_sfnt_off0000fde0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE0 16792 bytes