Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04f7a1c2653ffe9…

MALICIOUS

PDF

80.1 KB Created: 2021-09-08 13:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 624f2335f84dbbc0a1b19545a9a464d4 SHA-1: eced671bd6510dd2fcdbd29cee03fc080db67edb SHA-256: d04f7a1c2653ffe9f333145dc22818fe7f331ff914b5da2e12f195890431e9ff
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 identified as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous unknown URLs suggests an attempt to obscure the ultimate destination or to spread malicious content across various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://zuche0551.com/upload/file/33739913332.pdf In PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/vefujujifarujej.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/debovosun.pdfIn PDF document text
    • http://watch62.ru/files/files/movapekevufamedamifi.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///totino.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/43bc406b102b5930089858731433c7cb/37833437428.pdfIn PDF document text
    • http://licausi.it/userfiles/files/nibozogogonexazaxadavibut.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/luufrp9j9fl148t1vibg3qpm7n/penobukibozob.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/farilok.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/wupukafufufaxowisib.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/lamoxanetewabemafumaxemu.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131305e469b5---zawik.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/78954210169.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jejamugatigul.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/68897719562.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/64298243085.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/widisesukuwo.pdfIn PDF document text
    • https://membermimpi.com/contents/files/vemuwatimuwug.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/vawin.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/zarujuposodivebino.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/74820834652.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/76502063743.pdfIn PDF document text
    • https://qkon.ca/images/file/6726028816.pdfIn PDF document text
    • http://beta-rc.com/upload/files/poxapoduxepeginu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=mini+led+projector+hdmi+manualPDF 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_off0000ccde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDE 10836 bytes
SHA-256: 17c8a30febdf1efc15270df4ec5223b0c89c5cebe0c33d670fd0df03bb39785d
font_01_sfnt_off0000e594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE594 19776 bytes
SHA-256: eeeea97d28658ea9a00f303bedd82ec50c4ab5efe75393717a8fcb6c5ee0f74c
font_02_sfnt_off00011934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11934 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1