Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b8d5498ac2223d…

MALICIOUS

PDF

75.6 KB Created: 2021-06-21 06:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b6f520a6aca62daf470911126cb60074 SHA-1: 10941b8afcd0b13e937078936ecdaa46de6823b9 SHA-256: 85b8d5498ac2223db3dd89c19764d497ff29adcd5590f292b721bde818e15565
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute further malicious content. The presence of multiple links on disposable hosting and the use of 'utm_term' parameters indicate a tactic to obscure the true destination and potentially improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1b1245342---zegubitinede.pdf In PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/vucsf0ba2u4ov39qvrrjcrci01/juxilajujimutunutuxiworo.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/87227613004.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/75794507963.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/gozusutomozozikujoxosu.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/8021913288.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160715791908b9---56187153681.pdfIn PDF document text
    • https://airshow-bg.com/file/13442948221.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/e42e12fa48c3dfeb63309f622413142f/ditafemesubakapu.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b828648ef75---sekenomegavelu.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92520fe41---gawufuroda.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/zizoganubide.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/9d74370ad5b31e91bc376a96ac7e405f/mobunigujovonuzavuloj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=varnyathil+aashanka+full+movie+tamilrockersPDF 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_off0000de7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7A 5196 bytes
SHA-256: 38531624cf67a73da14ce6f4323dbfd63e82faf2dc14575b4fee01a662f18815
font_01_sfnt_off0000effd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFD 10416 bytes
SHA-256: 38a59b39510be6c18d4bad48134d24774a6610613905785a25a7bfb40bf88fc3
font_02_sfnt_off0001137c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

Open this report in the interactive analyzer, or submit your own file for analysis.