Malicious PDF — malware analysis report

Static analysis result for SHA-256 e12ec6850546860d…

MALICIOUS

PDF

77.5 KB Created: 2021-09-21 17:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 60178ad07f20c41569ec086b058e612a SHA-1: ca7f020361d940d8c4609d3b22007f73307174b7 SHA-256: e12ec6850546860d2177fde9019d288f210c7f3aa4cb0c41348319f02df8bca8
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm hosted on disposable domains, with numerous embedded URLs pointing to potentially compromised WordPress upload storage and other unknown sites. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://lachambredechos.com/userfiles/file/naxefumapise.pdf In PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161439e3601560---vesotalarilovogozaf.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/56802792522.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/65799424330.pdfIn PDF document text
    • http://baoveantam.org/upload/files/86007863682.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/34678469361.pdfIn PDF document text
    • http://wmsone.com/eimages/file/vewogevapopoxo.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f41e0bdd5---tofatikot.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/82537061946.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/95105489170.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/9071454834.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/31292439417.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/24883194995.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/kereded.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/pezeperolani.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/zemafabugaturug.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/xasajudofibomijavat.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/mufewuxujufedavanedelidoz.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e16826ee4---40960398493.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/54743637775.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/sadilaxemisibudigisim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+document+cannot+be+printedPDF 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_off0000cb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB59 17388 bytes
SHA-256: cee87d45244e6c7ba5fc869613a631db9b6e2e04e10f727764b935424834001f
font_01_sfnt_off0000f807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF807 10768 bytes
SHA-256: d4cfd36736da4e0140b5149bcc2db29c6226c256190775d43eaf0dab58b28af4
font_02_sfnt_off00011053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11053 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1