Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab34fb03b2dd913…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 20:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 45956804a156db39789ef42996b41c4b SHA-1: ac442cfba7a8ee7d016df14ec7ebdcc350d00aee SHA-256: 3ab34fb03b2dd913905d890ed7cfec26f2c7cd6cac6eb006b4615383a45aef9c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. Embedded JavaScript streams and numerous external URIs suggest the PDF is designed to redirect users to potentially harmful websites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the conclusion that this PDF is part of a link farm or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=android+cat+game PDF link annotation
    • https://mamo-tato.ro/userfiles/file/daxadodaporalanip.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/gezadapoxodajibum.pdfIn PDF document text
    • http://state-lithium.com/upload/files/74731342262.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/25386138323.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a54d7511c---pixowebewivig.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/20464384367.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/36606625712.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/peromelowekivexaxejitupuz.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/56018908401.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/rq5r3janjsbi8n6rub6rpgeq57/96924485297.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/76552413579.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/senibiso.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/57925759788.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/nixeruza.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140803c83aaf---71780784900.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16142d3f05aa77---disulewot.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/d054a27f2e8d5fd5b83fa93a1318ad7f/5789270650.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/80805909959.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/kepesup.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/73202132587.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331bb6175e1---mixejuxadurovixa.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/52006633554.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_off0000dee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE2 10480 bytes
SHA-256: d60569add3ae2623343b6b3ed16e5d66c105d61897f5bdcccba89d36fe254336
font_01_sfnt_off0000f678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF678 16644 bytes
SHA-256: 462c1938f54dbecf60d263777d624bd496ebab2cb8d74957ce201b8c7cc2abd9
font_02_sfnt_off0001216c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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