Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe4efbd9359d64ca…

MALICIOUS

PDF

87.7 KB Created: 2021-07-25 18:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 72eb1455bf6398a6630c969d78ee8f00 SHA-1: ab057cbbcdacebe90f53d8f823c2ac4a1a1940ad SHA-256: fe4efbd9359d64ca56043aa8edb87894dab0c037e06c0b691fc650a66126d08a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous disposable hosting domains, a common tactic for phishing or distributing malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://iaestedresden.de/userfiles/file/40910764190.pdf In PDF document text
    • http://kaupa.cz/userfiles/file/kuvusupijitifibapone.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc77a08dae---81261699775.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/3cb9fa3932e448ac34ef7ecc4001d2d3/7284482466.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/jifamutojabezunuwalezula.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/86813584039.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/pujitokelomodofomibosel.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fc133f446---wobitodose.pdfIn PDF document text
    • https://bor-diing.com/upload/files/nevisazolog.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/63c84a5b294893ffa61400a80fb66016/31546865614.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/46583526893.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/bakemufamamegagaxos.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/vojibosez.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/sokirojokopizupope.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/62812164707.pdfIn PDF document text
    • https://bloc-immo.com/images/vitovuk.pdfIn PDF document text
    • http://honda-vo.com/upload/file/74355296426.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608190a087b82---rusazoxewizezesob.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/36126081905.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/rirofitinaf.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609123a3de8fd---pedawowekinedusajekumimu.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/sjpusp77bhhh0l6ro4encl66o6/77414822763.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdbf3d7030---67683432579.pdfIn PDF document text
    • http://thebranchoflife.org/clients/3/37/37a84c4c47f147f839b5d5a44bb1b86c/File/vidaxiw.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750cf4b79b4---lajejumojiteluzewepulexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=why+socialism+einstein+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_off0000f23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23D 17588 bytes
SHA-256: 2219e164c85cc1d4a483dc8d15db27e9d9ee3cb37069fb8461e3fc2563015e57
font_01_sfnt_off0001201a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201A 10892 bytes
SHA-256: b4a3407fbc0d03651f2f01e15b4cb5b6ef145f83711bedd25f83814d9538a678
font_02_sfnt_off0001392c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1392C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1