Malicious PDF — malware analysis report

Static analysis result for SHA-256 14c5ecf0424c116a…

MALICIOUS

PDF

84.5 KB Created: 2021-09-02 13:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 98e9fe6817dfe8217be6aeb7395a6782 SHA-1: 6c726a85c095985c64c750b96b9b303ee6f80174 SHA-256: 14c5ecf0424c116a5e42a13503e923a4844a2fad60d542bd733b72ff96e1fac0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm. Notably, some links point to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://mfdesign.hu/files/file/zemizuxifamonepufamedo.pdf In PDF document text
    • https://editionsitaliques.com/userfiles/file/54628421090.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160955ccf8cd2b---73279957813.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/wufenusewuxuxama.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/47961820693.pdfIn PDF document text
    • http://imosa.asia/uploads//files/202108091207037320.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfd22617eb---noviwavofizolawoxafelug.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610bedb1e1971---dutati.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/nokez.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/284c0defb8423cc7995db7842474cdb3/pumititiluxasosuxodapom.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/0d1daaccd971747febf271cd7042f05f/wawelevagafenogudoborix.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/17448227344.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60B26B00367D8.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/7f472327c92400dc686d00e76a241be9/48691437401.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/xesula.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/cd2b85137f87eca5ad8251def4a774d8/18290242498.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a846dc9bd2f---xejejakobaputup.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/6c2e4bf2df77ffe7ac4f8c1d0f5dd9c4/56310441573.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/doridejupesemadegasokaril.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/4c5371629b680ca03c1bb6411872106c/rotemepikemulivemater.pdfIn PDF document text
    • http://fteq.ru/files/file/90860517997.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/fusasigixi.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/pejesowuwazut.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/63487511468.pdfIn PDF document text
    • https://beaszemin.com/files/wonizitekavap.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/9937405808.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/14e4b8edcf31079ae73a2361f3f8e2d0/85722197550.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=environmental+chemistry+pdf+notesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF9 18884 bytes
SHA-256: f5de9232187e03af13f2bfc3b7d62b583af9b26c693679bb107a74c014089f49
font_02_sfnt_off00012a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A71 11048 bytes
SHA-256: 574fd7f24644734c4f110c1bc441a30cd45210e6746c9bb95745e90f4141f460