Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e6344cf0257f7db…

MALICIOUS

PDF

90.1 KB Created: 2021-08-03 20:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6b68e2a05289ea8b4ec3db241af7f3bd SHA-1: 6260d07e9d4c823d7a30cbacd8b347997d3b661e SHA-256: 8e6344cf0257f7db37e933b75b4b0b8557f44b3e5d56313b37204386944179e5
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. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or appear to be part of a link farm designed to obscure the final destination. The presence of these links suggests the document's primary purpose is to redirect users to potentially harmful sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6115

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c417522d1e6---27669824711.pdf In PDF document text
    • http://mea-travel.pl/userfiles/file/mutodatozavixelal.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/fimopanafiwemozuvodanopu.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/bukokezalezuzajumili.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/0tutrerfervhssqme942kl6vsp/jofetidel.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/91329435635.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/71493117902.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/tedapiw.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160913fa3bb59a---73635960313.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e936c390810---3500558607.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/fichiers/tikefakanebuk.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072072b46e1d---1460255284.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/08jjnr9ubhi8269je8l85pak11/29581881555.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/77697315672.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe87feb126---1398085488.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b4329801e---55078613566.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/18252799506.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df94d4baa7c---vutipowuwaxosi.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/tabozimejaniwi.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106d8d450365---bagojepofesakepufeluwofe.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b05f0ea7d7---60537952478.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c441ff88b52---zebuwomekexokajuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=txur+xosqer+mor+masinPDF link annotation
    • 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_off0000dda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B8 10436 bytes
SHA-256: bd44b0d9de4997031216a3ca482aea9f0f5c5504eb3ef9201240f3c47e002e52
font_02_sfnt_off00010d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6B 35308 bytes
SHA-256: 4ebf9d06c0be6ce403de7f5bae139f77a95bf1ac6dddf8c15912509d60899570