Malicious PDF — malware analysis report

Static analysis result for SHA-256 8930cd4e801a403b…

MALICIOUS

PDF

83.0 KB Created: 2021-07-16 23:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e634d9f3dce8d4519af351fe2dac1935 SHA-1: c688f8fa83e49c33adcdab284b176999ef93fb8d SHA-256: 8930cd4e801a403b7cf39d90ae876331ec4cfb384f1e56deaf19296487b2af8d
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated high maliciousness. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings strongly indicate a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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 http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc4f4dfbd7---73095552021.pdf In PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/b0cr8nhc8m5jg7d7rl8h6heiv1/kupodepe.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b6fba0e92---20336608639.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090f59557332---wajeduzofi.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160765eef1b77b---84870039812.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/mewuxejexog.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c227cb9057c---kurowajarazamem.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d91a211cff---jubasuz.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eccfa5ffb9---najitunotow.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/mvl74g6l5p05eap3m0vj4m2362/88087971056.pdfIn PDF document text
    • https://petikdaun.com/contents//files/wapezeginowoganudugog.pdfIn PDF document text
    • http://refta-bg.com/userfiles/file/5439824615.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/93624945937.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fc149d0da---7015438902.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b19c1df00dd---42744165046.pdfIn PDF document text
    • http://schokobrunnen.com/idata/56013014306.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edb52c2c62a---89066217149.pdfIn PDF document text
    • http://allycatering.com/userfiles/vakubonifisap.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/5beaa7dc0b28c5d4d9e149811a863910/3486128402.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021070813001488.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b431dea43eb---xebunuwom.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/zusipazevusumugofiguzopa.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/182234519679.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=right+testicular+mass+icd+10PDF link annotation
    • 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_off0000e11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11B 16548 bytes
SHA-256: 7945cc1c5f8c235237c784a1077ae55f9567326983f9523bc8fb327425861ae5
font_01_sfnt_off00010c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0F 10912 bytes
SHA-256: 96dcbd1181e40bbd8c5f7996bf6776b36cb7a5de38ca12e4f50d4a669c459acb
font_02_sfnt_off0001252e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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