Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc2b1c82f03f239…

MALICIOUS

PDF

92.8 KB Created: 2021-08-23 19:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a8760c64997a7fb5a64f2961e155f12c SHA-1: 9c40ae06ac4e2b2ee62e46bb950b839bd7e2d8b1 SHA-256: cbc2b1c82f03f2392490996d3183b8cb14d9910a58fc7b82241bdd2961742c8f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/135a3a9f92cbd54a1e256d8c050bfb14/jekasevow.pdf In PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/dnri323l57i5ai23l7c64g30r5/46045965619.pdfIn PDF document text
    • http://szwygs.com/upload/puwitegokalotat.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/11a6d59c7b9819c6911703616f25c698/35741629071.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a20e95f58---82298326902.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/25a49fdba4a73384f04d99406bf2c579/zivusulod.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4b2358f32---wukuvexilemipomun.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/51381478493.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92ff7aee2---19225041580.pdfIn PDF document text
    • https://lanjutpt1.com/contents//files/lerotavokomepusefatoxazi.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c388b3d2735---puwugepuvotenejomakuvej.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087829720c98---39099246192.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/tirazixalulit.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/budekivevulefege.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/bazigup.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/90909762666.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f2c45aa782e---61586784975.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/ffd4dbd74adcd2f8365187c4ed2b7707/dibixofuzimadosotidovo.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/f6c29f3b0cffca56aca7c62b5297ae7d/jopuvogijomes.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad44303a74a---bugimamimelof.pdfIn PDF document text
    • http://indecomavo.pl/inc/25497106779.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742652d8bd8---nefix.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/69232825905.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/lixubixaruxozuxa.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d6b71675b---pulamon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=don+mclean+american+pie+song+meaningPDF 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_off000108b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B1 10620 bytes
SHA-256: 66910596123741c93cbf719e1f391db411c494dbe48d2676dc16096d7a716c05
font_01_sfnt_off000120d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D5 17032 bytes
SHA-256: cfe48f02590ab439b85851d61cb87f5efe049a4969ec2deafb1e4c8a4ad30e72
font_02_sfnt_off00014d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1