Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b8fd1b4e1eb496…

MALICIOUS

PDF

90.4 KB Created: 2021-06-25 21:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d661c033407c155378c7b6d3b0d9cd7 SHA-1: 588ae1167526e13f903cddfc7821da82cc96257c SHA-256: 04b8fd1b4e1eb496ce42b4eec82d67cdbd26d56a433b12af8dd1f1a4c10bf0f4
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised or disposable, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues about its purpose beyond the presence of embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://parc-hotel.info/file/sirusirexisapafodigixo.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd8c22c56e---67606670437.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55a658792b---wufasi.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b564f2d468---zusopinerudedowemur.pdf
    • http://myphamasia.net/upload/files/17820523184.pdf
    • https://powermailer.in/userfiles/file/97332750437.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078861030405---76381940865.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/508c3fb567228931d1d9219a63cb23f5/62851367005.pdf
    • https://b2cexpressdemo.com/userfiles/file/2325774716.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/q8npnpoeulchvf8q4ea9sjb219/27402737007.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/0ta4tp0gknicl39uj7vf0sq67m/difufusik.pdf
    • http://animalscipublisher.com/files/upfiles/file/pujotaja.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/5e24d7ccb55d1766b1cc1478d2353f1b/mitaremuju.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/pt9k4771ja8eujleki568si8nb/38630099536.pdf
    • https://csn-alliance.com/data/files/58142955172.pdf
    • http://riskhedgetech.com/uploaded/file/93037866960d46b0a40de3.pdf
    • https://alves.bg/ckfinder/userfiles/files/tavopep.pdf
    • https://topclassgreenery.nl/images/file/57535618081.pdf
    • http://ecandrychow.pl/Image/files/vajazunurinisa.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8e8a657ca---tobawubifetezunenuwew.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/lv6e82glmpaooa8chm4l5rl5r0/91971592020.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/29s1er5htu6hguiklefj3io7e0/14711578066.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd0b256b79---99024537362.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/d794cdd4c134774f9e04ccdf54972a85/geropijizugu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=happy+birthday+old+man+in+french
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee7c.bin
d64d176c1af824e8d22b8b5edc12f19097cbf690e1a5d0fe7b66616fa4ceb5ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7C 10960 bytes
font_01_sfnt_off0001076e.bin
378fe3365b20c4f15dd34e4b3ff7e656cb956eaa0904b29823aebc9f41fd118d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1076E 20604 bytes
font_02_sfnt_off00013a1d.bin
bc0b2a751539e897c8e9f43097dedf64b9ef5e7d97f6d456e4236d45b5167eed
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1D 2144 bytes
font_03_sfnt_off000143b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x143B5 16792 bytes