Malicious PDF — malware analysis report

Static analysis result for SHA-256 84ae31edc64eb408…

MALICIOUS

PDF

84.7 KB Created: 2021-06-29 17:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c5526754b16ade14832e3ce895759f52 SHA-1: 8cba4cae07e889bf9adcc3da55ebb11d660cabc2 SHA-256: 84ae31edc64eb4086306101b3896540afde766a5f372d8a2724d55ef7c33f2a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics identified the PDF as a link farm pointing to compromised websites and disposable hosting, suggesting it's used to redirect users to malicious content. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://chcial.ru/uplcv?utm_term=character+of+parson+in+canterbury+tales PDF link annotation
    • http://project-lovcen.me/userfiles/file/vojefibar.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/jorixaposuro.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865425e2ae3---63694576106.pdfIn PDF document text
    • http://vodnik48.ru/content/file/tabaparinimus.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210627042041993.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/59030430918.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8702909d07---direrajedinowudono.pdfIn PDF document text
    • http://artside.org/data/temp/file/bivurasubulimabali.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/52118603981.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/dd5c62669c05543e57bfd07b637780f8/zuvexiwoketidetosidibazo.pdfIn PDF document text
    • https://kiameds.com/images/upload/files/71414673511.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/66951116982.pdfIn 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://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_off0000e90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10123 10960 bytes
SHA-256: 7a2fda463677deff80a7302c9c750e9b74b23712b9d48d1a9756075b78d98376
font_02_sfnt_off00011a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A54 16832 bytes
SHA-256: 4d0146e48076185fe929abc20c5d3f6a1134686a36801bd155afc0f3f8065210

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