Malicious PDF — malware analysis report

Static analysis result for SHA-256 db09e07197537df6…

MALICIOUS

PDF

80.9 KB Created: 2021-09-04 19:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a9adea7ac8b743f99c9644e29eba0fcb SHA-1: 58f6c6ee206186dbd66f86084914b21ca82a52e6 SHA-256: db09e07197537df6231a45ae693da18fb52002d6c72403354538a57ab78be6b1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various websites, many of which appear to be compromised CMS uploads. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest the document is a link farm designed to redirect users, likely for SEO manipulation or to host further malicious content. No scripts were extracted, but the extensive use of external links and the ML detection point to a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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://allytemp.ru/uplcv?utm_term=world+war+2+diaries+pdf PDF link annotation
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47f50447a7---patiwozupo.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/zufopezawo.pdfIn PDF document text
    • http://hopkinshigh1961.com/clients/878968/File/19422163412.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/73272973914.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/zenozipapobupetexal.pdfIn PDF document text
    • https://bursac.net/userfiles/file/50579822505.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/82582627818.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/3408479774.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/35679341730.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/28592b30ca193a7a616acb87d6f0c196/23541385729.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a979277f0---18853126251.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/9b35f35c166cf4bbd817eadc3a644ab5/29325302822.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/30034898d4f8d919123e38d8d587a3b2/devoj.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b16c850dca0---59690917956.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4ee05929c---tosolusedewugosaroboxudog.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b163c7648d6---40796447719.pdfIn PDF document text
    • https://kawanmto.com/contents/files/fudajamajitukixiruzujajen.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a0695071---38330147875.pdfIn PDF document text
    • https://agatanorek.com/files/file/56535882016.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840bc084f4a---40036188750.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/78347706865.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710c479fc1c---lovutilawikovexudevew.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/rexodupezetew.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_off0000d516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD516 19008 bytes
SHA-256: c68cc6e57b2d70cbaa50d6a47ca56e18a7b70a5f98a29e48ce35670ec862f374
font_01_sfnt_off00010657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10657 10488 bytes
SHA-256: d605cbc2df7503236cefb65a156de353d112056638624eaa75777651a1978da9
font_02_sfnt_off00011e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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