Malicious PDF — malware analysis report

Static analysis result for SHA-256 167584f145429480…

MALICIOUS

PDF

82.6 KB Created: 2021-07-31 15:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc8408db7a5df0a9e819bd39b77fb76b SHA-1: 22f9e657e3894b0d0bcffa2e11f19b34c9e8bc77 SHA-256: 167584f1454294802a6019b2baf6980acadc8cd6990dff94e0d4b56fd79da3a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://gulceoyunlar.com/calisma2/files/uploads/vijovubewogopos.pdf
    • http://tycoonmedical.com/userfiles/file/54511123607.pdf
    • https://cleaner.pl/userfiles/file/52303347050.pdf
    • http://eko-inwest.eu/upload/file/pumevesexurovowijenuf.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f47cc183e---71585378487.pdf
    • http://electriccityusa.com/images/fck_uploads/file/47539217416.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/itjf1iimoqr9pqcph7k76tfl8n/litibofeluved.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/d7kcn8bofqtoehhhjsocknnn77/sitimivenijamizebimot.pdf
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/buzokumebulabuwaw.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160803006c99ee---63502395383.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/tptjeg4vuppacfdeaojpv87516/11879240411.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/dh5fc7eae0da36d87gfsmgh9v7/52815396426.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/c2b2460209643b56abac9a2243336dca/22368219353.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609434f251ef0---91112316054.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b39d8b6f7---xanuminuzumudazizuz.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/170b1b8d20987e4b715c2f4cef08a641/poriwokivinikosogi.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4d03cpa32khrlbj3619htpc9s2/xilikojiwawiwolamibeb.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/093d8p34c3nbbb42t1jm6v2mr0/rujadigegunipise.pdf
    • http://driver-jazda.pl/upload/file/xivesobagugizo.pdf
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/4083913148.pdf
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210529013401.pdf
    • https://alamansyria.com/userfiles/file/vivuwasorurune.pdf
    • http://zuestag.ch/userfiles/files/17029735318.pdf
    • https://lifesmart.ro/ckfinder/userfiles/files/welunered.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=to+kill+a+mockingbird+complete+audiobook
    • 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_off0000de14.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE14 16792 bytes
font_01_sfnt_off0000f626.bin
6502d5638919d22efacfab098a1d7f5672dfdff88b88c8ea7e89ca7225092dcb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF626 17120 bytes
font_02_sfnt_off0001228c.bin
f59d7363ce101800eda881f0d9902dd3453ed4336ef74a60de298faf4abc8a12
pdf-font-stream PDF embedded font (sfnt) at offset 0x1228C 10984 bytes