Malicious PDF — malware analysis report

Static analysis result for SHA-256 164dffeb4e0a3058…

MALICIOUS

PDF

72.0 KB Created: 2021-09-18 02:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fa997be3b559ce69b33288f74a4d712c SHA-1: c029b3a1c810ccab4e2b6e1f53aac8e213176397 SHA-256: 164dffeb4e0a30589c63bc1830bdb037cba704a757c0de22b897a0b54f4c2773
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://catamma.ru/uplcv?utm_term=how+to+use+gif+image+in+android+example PDF link annotation
    • http://hp-cnc.de/uploads/files/7334339092.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/gejipudivavi.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/74754261278.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413916dafa8---sadexuj.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/ae62b909fa5839d40c47c06160fcb16c/wakixokobejowodusosava.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/80386470052.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161444906b9e53---46188597087.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/13822522543.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/tafisenotisitudesasez.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/fokibaredezug.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/7671195849.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144222d7a5c6---janoto.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/defami.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/76910679917.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b174e73008---62752529803.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/wugevo.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/vazanikojogufogapeva.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/93453847463.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/ac63698f3360939396ee9eaf0d4909a9/fivojezufesenogif.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/48692723260.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/90323746231.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/61153859841.pdfIn PDF document text
    • http://stisk.com/file/7343706011.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/jadukovumaja.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_off0000b600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB600 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE12 16696 bytes
SHA-256: def5f38addd91e85237dc358f1b8046c6ae430c4b13453c5cb60103950177647
font_02_sfnt_off0000f872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF872 11120 bytes
SHA-256: 0ef21d37562e1b5a4fb48fae05d100c05eba5cc49643249915b679d0e308a28f