Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d49034c6f45cf48…

MALICIOUS

PDF

70.9 KB Created: 2021-07-16 00:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 98072d7e84e0a7468000882a307dbd29 SHA-1: 9eda31fd7b788d5a8707bb93198aa9f663205fe1 SHA-256: 8d49034c6f45cf483bd08bec4da21450b14999021d485a7a292d515200e651c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that form a link farm, directing users to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of multiple external URIs and compromised CMS upload links points to a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cructi.ru/uplcv?utm_term=bottom+of+my+feet+hurt+in+the+morning PDF link annotation
    • http://morethancars.nl/uploads/edytor/file/88536502714.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/toruzezewijim.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/23033371689.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4ea1f0940---dimatanopi.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160786df08f847---20228405225.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e5be4f7f0b5---39150979391.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bbd98a1e0---xuvujetetexaludedobax.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-8/20210508132852135397.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/0iij93teit4v6qieh2sn7du0fe/75147592028.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b9a1c5453---gowipirafibojuviwegurupa.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/10077932149.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/98717037307.pdfIn PDF document text
    • http://simpelms.nl/userfiles//files/66666688092.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/80611254688.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/segobasewavujeguzok.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085578b5a9fd---60803180519.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e125faa33d9---46692961928.pdfIn PDF document text
    • http://talleresjpg.es/img/file/fixigatevovezal.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/lofavawikutizeves.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc6e8d1a7e7---tofizanafisafega.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609033dd0dbdf---boragado.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/79175105431.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB693 10552 bytes
SHA-256: 9a9b54d0f81aec6daccf862d94796ed4ee31717d824857337e557c3bcef1bc49
font_01_sfnt_off0000ce78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE78 15760 bytes
SHA-256: 07cf0a5b68b92fc4e57eb70a9979322c3c37c90729014ec8d30bb0837015df8d
font_02_sfnt_off0000f68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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