Malicious PDF — malware analysis report

Static analysis result for SHA-256 6313b04705641351…

MALICIOUS

PDF

92.6 KB Created: 2021-09-07 11:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 504d92ec0ec82d4b5ec31eb97183b3f6 SHA-1: f38832c4ae01eacd9e491011e1d56ab2d879c93f SHA-256: 6313b047056413516c25a40615cd1326bdcbdff02e50fe9d148880406902c9d9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristic firings strongly suggest a phishing or malware distribution attempt.

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 http://bastola.org/userfiles/file/91973658373.pdf In PDF document text
    • http://asja-doll.ru/userfiles/file/dabix.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd007d5b36---dixizi.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/edbe5432f53ab961ea5d584c6acf2494/nirijerawexebesota.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/42409581685.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/28794733394.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/76194681882.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/30515153890.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/f9abt4fc5eapfvjf8s3fiit8f6/70129562424.pdfIn PDF document text
    • https://arzhosting.com/calisma2/files/uploads/doviworiwideg.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/wilatagefev.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/wisezifojekabev.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c09563171---58369204406.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/60f823c3cfddf8cd507413fc3f9b3287/liwafidapepijuvotojujoj.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///81635680444.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/45620146907.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/53t73hman8m8vva3rr528qpma7/1751080258.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/70790504806.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/28606770360.pdfIn PDF document text
    • http://compsult.net/userfiles/file/64259153969.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/89909417919.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/edtgvk8issgks9m2450kcjk3ic/werufofitulefot.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/begabakevosatixemazu.pdfIn PDF document text
    • http://fluellensoflandreth.com/clients/b/bf/bfbe38bd58d8cb8bd08b82175287e3b3/File/30308878897.pdfIn PDF document text
    • https://rajaunited.com/contents//files/mamirabaven.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/p76i1p50079hc36evt3b2vckb3/66780366401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=top+20+figures+of+speech+with+examples+pdfPDF 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_off0001026a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026A 11456 bytes
SHA-256: c8ea5a6bf1dca63d46d714e172b7f5e136fa881ebcaeb77017dd48a8047424f8
font_01_sfnt_off00011d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001358b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358B 18344 bytes
SHA-256: d23884d096080721c6d95f5dc6f2b794360e728aeee3857e50abefe777a18f67

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