Malicious PDF — malware analysis report

Static analysis result for SHA-256 a56b00195bd7d4de…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 19:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 367f9c4c4568c0fa776e9eca2e7dc610 SHA-1: 13d2516ac242b5296e35453002ba7bf445955096 SHA-256: a56b00195bd7d4de98936110d057788b6fd418927002c151e3718212b405c877
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm with numerous URLs pointing to potentially compromised websites, likely intended to redirect the user to phishing pages or download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • 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://laborke.ru/uplcv?utm_term=five+nights+at+freddy%27s+2+online+unblocked PDF link annotation
    • http://chukysovin.com/img-svc/files/vejotiwojeke.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/ee49779f29259ca7cc6e31b96c51d39b/30139131992.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/23977764621.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c9ab095a4---11391045609.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210905130905_hny615.pdfIn PDF document text
    • http://tencanpowder.com/d/files/18034427495.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/pozotikobikoxuzovewoziba.pdfIn PDF document text
    • https://phr4u.com/files/debifubexeto.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba03d099b9---rerun.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/67487891908.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/bakabudi.pdfIn PDF document text
    • https://kaparatt.com/images/File/89045663680.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/vufuleriv.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/19945691814.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a988262e24c8d0e9f0d6048c0a2902ce/23983822208.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0811951001631207890.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/ziwiripozijawosarawane.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/25011805683.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/25cefc43fe4624fd09e7480f4088966c/xavovigefujubiwarefow.pdfIn PDF document text
    • http://btfa.tw/upload/files/39173278786.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/161362f3b8e383---renurijabisabedokewekek.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/11317222772.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_off0000d05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05D 19048 bytes
SHA-256: eb27f1fa48f658fd9dedd36ef36ed43ae93fe0d7a3f90cfa966d06d207811338
font_01_sfnt_off00010100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10100 11400 bytes
SHA-256: 498c1e70eb98e8dfa8b25083001d9c58ec590d8ec65fa4767cd3a49985396fca
font_02_sfnt_off00011bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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