Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c0daf1ad72ea33a…

MALICIOUS

PDF

94.8 KB Created: 2021-06-12 21:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b74876f1ec6f8ee24064ecc974777a9a SHA-1: 90c43120fb35a4ed9134528fa0493e0b8f3ebb1d SHA-256: 7c0daf1ad72ea33a537fe8d8759c251a8deaf1ec4561efbc01b8f0f8ff4ffbeb
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, appears to be a lure related to 'psychology worksheet answers', aiming to trick users into visiting these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://smidgel.ru/uplcv?utm_term=chapter+1+perspectives+of+psychology+worksheet+answers PDF link annotation
    • https://cafesca.mx/ckfinder/userfiles/files/lokovesivutigalebojiro.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/7sbf0t35uha8grts00j5j628d4/40314982408.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/31kvmkjo6hqbeb0utkn5u4bac2/68337474602.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acbb07b1e3---37494248803.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/dijotibojobubogaleb.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/56786732968.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/0b567475e6b3cea74b6ec2a6cd3d895d/lomepivozakoxoseligavete.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/zasumigukivawavuv.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/a43920ab371b2003f9ef17f9fff4fd8d/50664227241.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/950c1972b15a61db2cdadbf828bdf791/94082742028.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/9074705327.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084e8d8b9427---wevetajokomubupe.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/05378e76440aaeead0d64711429352d6/65335202464.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/97904854420.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd32a372b3---62207999677.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/95ff5d9a663419a41c4aa66f81f7a98e/tuwefes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13737 5552 bytes
SHA-256: ebd6ffd9ff707b484691d400efee87aecc9205d0989a6e9bdbe34ce0690a3a45
font_01_sfnt_off00014a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A38 10524 bytes
SHA-256: c9a17b29c0a5efd6b2d305e9c792513647e6c3a1e8548c823fa1b34caa69ecc1