Malicious PDF — malware analysis report

Static analysis result for SHA-256 b34cbe44995fb248…

MALICIOUS

PDF

84.5 KB Created: 2021-09-20 11:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d83fc8859e0049a68679b57c7beb30dd SHA-1: fbf385342a0c7b566e41d024d40916792bbd0973 SHA-256: b34cbe44995fb2481da87d487514acb0856d616321d45a772fa49d7f140363bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. The presence of external URI links and the overall structure strongly suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://europartner2.pl/uploads/31253041741.pdf In PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/0eb0b00f21f527988272a9b332d236b1/nowetugagafolaxa.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/fawubekeferumojuvokifuf.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/16926963670.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/93471554521.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/34861246677.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/65095744154.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133b7b25313e---49759510782.pdfIn PDF document text
    • http://licausi.it/userfiles/files/xegominepuwev.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/xixupazodivedaparur.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/30917396695.pdfIn PDF document text
    • http://malifer.hu/upload/file/zoxapiwa.pdfIn PDF document text
    • http://specimport.by/files/files/dapetiwalut.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ve79jv42i4m4lqmgjuerd1lm4l/48537917108.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/84069594041.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/gbfhugjll536lau7vu0odd8q96/jumubotimef.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/70881001475.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/majasofapojisilefojil.pdfIn PDF document text
    • http://chieucoingason.vn/files/39322695603.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612efff89f842---dunele.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/uhp0b4dnjbjl9aciv3nlndnann/jujujujufo.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/45031389580.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/87865808181.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/78239872505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=android+record+video+with+external+audioPDF 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_off0000e56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD81 10636 bytes
SHA-256: 956ba7ed515d57f9303f87b2332b77056a26832cb14c6d5a236f754722a203b7
font_02_sfnt_off000115ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CE 17844 bytes
SHA-256: 24a65643ca0275e46b5e7d26f410b912a81bc040cf598d88cb6221a0a57e90b2

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