Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9023e7dee925fc…

MALICIOUS

PDF

95.3 KB Created: 2021-06-29 20:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8fb7ad9ad1ca33c93ac960cdaa690eb9 SHA-1: 102d50f43c95ff9db4edc932c1b739b81c4d66bf SHA-256: df9023e7dee925fc911f38ced783be88475bd7cc9ac1713fda705e5d9963251d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on potentially compromised or disposable domains, designed to redirect users to other malicious sites. The presence of numerous URLs, many pointing to WordPress upload directories, suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://queure.ru/uplcv?utm_term=displacement+method+of+analysis+moment+distribution
    • http://oreade-breche.fr/userfiles/file/9819122000.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/s2aaefuhuf1l6inujos5vu74u6/jotam.pdf
    • https://brothers-music.com/ckfinder/userfiles/files/2473002550.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/4be13c3a92b0f1996db436c29425e924/gazuxorolidotal.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/be3414210d5d118213b5641b6ede0665/37378575151.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/po40nqs1em75mjv9otvcmlign0/sekejoketudezorisa.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160833c025fc03---bezegavapek.pdf
    • http://bjaimama.com/data/upload/2021/05/file/202105121259019081.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607efb0ec7e97---92070375251.pdf
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/83803819738.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c140a7293---50648405937.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/bbc9e444f25c353e025c1dc339aae37a/lamebifokapuguxekokip.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/oaitoq0urg7lg7tlb6hshop11n/lirazivujazuze.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/6f5ff32d9b7a7dc1092753adfa6a78b0/28853469214.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2d6aec04a---12653528032.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929981e699b---34166322725.pdf
    • http://otohondamientay.com/upload/files/76472208289.pdf
    • http://harchovyk.com/userfiles/file/96956050054.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b2283a781---tipipowuwamotafalo.pdf
    • https://baoholaodong24.com/userfiles/file/74255563569.pdf
    • http://shinies.ru/img/lib/file/99080624101.pdf
    • http://www.deopendeur.org/imgUser/file/984264094.pdf
    • https://swagath.co/new/ckfinder/userfiles/files/27595354675.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_off00010d23.bin
7d89c6ab51b1959d056379f12dde4349558ca4bdad674bc2b239010b1f456b13
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D23 18236 bytes
font_01_sfnt_off00013d89.bin
085aa272c722b4f6b6332dad753e282cd94b97759c73abda30481dd29852e351
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D89 11240 bytes
font_02_sfnt_off0001577b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1577B 16792 bytes