Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18ab76748ea98e3…

MALICIOUS

PDF

74.2 KB Created: 2021-06-23 02:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 46009300a3b90f94b2a67a173e027e74 SHA-1: a3f4da9d6be6597b8d128ae9ecbf6047b37d2d2c SHA-256: b18ab76748ea98e36c4c3ee867a4294ee1cfb7574db3dd37ad8064a30e972006
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to various websites, many of which appear to be compromised CMS uploads, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to a 'Laserjet 2015 manual' and 'wkhtmltopdf', likely a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://asfalon.com/__files/file/kiledaxelugajojemuf.pdf In PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/42589adc208fc8e31dad57d4f5d8d21b/jumag.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/af2764b866dc47d75e647dec6382207a/nabewus.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/vukefimofasojidumobod.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/velefof.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084913589f78---keramoviweteratesuvefufi.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/aa1cb1868bd68db7df1dc0ea267b6920/89666167220.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/pemipezajajoxulukusikuri.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/juzafinobono.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/63600491920.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/59082997853.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210615152152758.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c481bd19977---82441835713.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/47670752589.pdfIn PDF document text
    • http://cichanski.com/Upload/file/43282869772.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/7166627df78652bd6e02d2e4efe05f6b/58449531661.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=laserjet+2015+manualPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD729 5300 bytes
SHA-256: d72578c27f450a7f5bae2c4566f8dcec6ee0245373b43cbffbbbb1a7af0e92bb
font_01_sfnt_off0000e918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE918 2268 bytes
SHA-256: 87560c96094722e0b06e960fc6e6e0982e5dd9a45b3b8c8ce6a725bc3f373f32
font_02_sfnt_off0000f32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32A 12784 bytes
SHA-256: d3fd3fbc4c2d75134e6557e4508c2bd5c4a590087d825054cca58f60cdf5307c