Malicious PDF — malware analysis report

Static analysis result for SHA-256 933d31ea0cd86ac0…

MALICIOUS

PDF

95.9 KB Created: 2021-09-06 18:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 49e1cf1a1937107821ef350109d38e3e SHA-1: 00dbadf2def72ce6ca3b108ed1136393b64546dd SHA-256: 933d31ea0cd86ac0f8b60444220d595702127bea4c9a9fce3eb199f41649e16c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a link farm or phishing lure. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the presence of many external links strongly indicates an attempt to redirect users to malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://fujavietnam.com/images/Download/lafozotenivudoxivejexa.pdf In PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/321efd2e422f53f1588bb0c600873341/97233696728.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160742b7573909---98226168293.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9ff75c970---jazofesosagexisupekafoke.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160adec6a840c1---sotelegazivagoze.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/23960962993.pdfIn PDF document text
    • http://oris-am.com/editor_up/24016768973.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/gadawulefejibajitem.pdfIn PDF document text
    • https://hgb.se/filer/file/25632358287.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/57333429140.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/ruzonuxile.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/susenajadusa.pdfIn PDF document text
    • https://mar3ol.com/Files/files/97413740508.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/894b408827b4810e2e348a2125d79517/lepugemo.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/25704170725.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161104430f182e---90443314051.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e9184e23b---29190501031.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/31962311670.pdfIn PDF document text
    • http://airlineclassof66reunion.com/clients/c/cb/cb51827d251551eca15067b3b23580a4/File/19588123477.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/34730498201.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610ac7f386129---wovepasemukigamimuxevik.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/vemupejuvujitezo.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/rajizuraratem.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cb0acf1d5---gowaruxomit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=tanatologia+pdf+2018PDF 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_off00010bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC9 10736 bytes
SHA-256: b5ffcf01e15202e9d0e268b9620f3950324af694408082757f12634ffdb1857b
font_01_sfnt_off00012473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12473 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C85 20624 bytes
SHA-256: 72c579965ebc57bca23b05b00d475356a87d60df75e9cd841f5159adbedab2f8