Malicious PDF — malware analysis report

Static analysis result for SHA-256 34230ed4f0e2393c…

MALICIOUS

PDF

84.8 KB Created: 2021-06-28 08:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: abe15dbc92c02145ce2dea2d06544fef SHA-1: d1491b2fcb74be1be7d5ee53270183d501279cc9 SHA-256: 34230ed4f0e2393c311f0e438f5b2aff4a1413f470346049a454a62af2d43a8c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and link farm heuristics, indicating a malicious intent to redirect users. Several URLs point to compromised WordPress sites and disposable hosting, suggesting a tactic to obscure the true destination or leverage compromised infrastructure. The ML classifier and ClamAV detection strongly support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://cimkezes.hu/uploads/ckfinder/userfiles/files/kazotil.pdf In PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082396400184---15444593816.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/39771320258.pdfIn PDF document text
    • https://ivaco.it/file/zamexonorexudu.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/a1b9fdfa5283ed93aa88c5cd7f976002/somosipulet.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6ee74afa4---vutebupanidit.pdfIn PDF document text
    • https://codecs.roimages/file/45728071389.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbba2901a7---zinezojusulepuju.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/nvau5bvtjsigihcfsbifnfm8q1/lixedinadawixogi.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ri6jv6guuusukj1o0v3sc40aj5/pisobesinoputigukedon.pdfIn PDF document text
    • https://rosycaffe.com/file/boxituf.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/961dfmdqd5or9rc8sf8sofk81c/laradudalu.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/borodesuni.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/61827785909.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/werobogepu.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/6582077442.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ac37101e548---94500826013.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/b87819b012bad2f01cd33e1cbcb6b854/88959339577.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c504a716a93---fupuzazapu.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/46712815437.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/thdeu9siqr2gdajnn3mlstvbn4/jujaxitamafo.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/162350314647086507528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=difference+between+xylem+and+phloem+tissuePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE439 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC50 11428 bytes
SHA-256: 5f873216ff6622f281802dd24e28da1398964d0edb84e977b23026fc3a9221bb
font_02_sfnt_off000116ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FF 18192 bytes
SHA-256: f05bc095edd5db8b95d4cf4b0be6a5eaa23b24382bdea105a3e77788bfc3a857

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