Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0483b483a3813cb…

MALICIOUS

PDF

78.3 KB Created: 2021-07-14 10:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd35a2f27ea530b85826aaefce1bb170 SHA-1: fb1d7625a1a8ef105d2527abf77882478731b152 SHA-256: e0483b483a3813cb1876954a35d56e8b3b037f57e670c82f53c35a702930d8e7
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and IP address literals further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7fab3343---81298923497.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa0d413883---71351246214.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c55af703646---tevemupalovogi.pdf
    • https://divinenine.net/userfiles/file/51321774636.pdf
    • http://centroolosprato.it/userfiles/files/53714617121.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/00fa45824a34deec7187b0720b15cfc4/rurozuxutelawufopesinox.pdf
    • http://ibconsulting.it/userfiles/files/rakutenojaguniwabiw.pdf
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/voluj.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/3d8228220a861aa65f021e67887c5bed/60179035441.pdf
    • https://hamasataccessories.com/userfiles/files/65489192925.pdf
    • http://backupcenters.com/userfiles/file/metizukixalebivonebitubun.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160844acb9d589---vititiwozopepamapotoga.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/6e658e268c22cd49a5a5c9f468192b26/jujapidevojaxizukigadajo.pdf
    • https://artasedanasingaraja.com/uploadfck/file/78326936257.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/3cb2c314999fb8c74950c263f9b332f1/13180925942.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/f8d45005c1ae18dd43258672f3d972e4/54722917536.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/26e44372fc26b3616eb2bde6b6a37f8c/88946020890.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608549ffa3050---nuxenazovuvodixizopugowu.pdf
    • http://wo-kop.pl/userfiles/file/30473966516.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160856cb279ec3---44742104251.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/4me2tpni01rfhgljjo8v1eljd8/15705330474.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160cd65b68c189---26282540311.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf5f4a8d45---lanasirirolitimo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=cultural+ecology+definition+ap+human+geography
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d021.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD021 16792 bytes
font_01_sfnt_off0000e833.bin
ec7264d6f511d9e9d183080aea930cab2d5774d07e59b95b7191f776dccd64e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE833 16352 bytes
font_02_sfnt_off000112a3.bin
03166995572572917305bdcb3a62f04872e0dcd74fb191d1bbc8f2f1546b8a97
pdf-font-stream PDF embedded font (sfnt) at offset 0x112A3 11144 bytes