Malicious PDF — malware analysis report

Static analysis result for SHA-256 83cb9b1304f23a47…

MALICIOUS

PDF

83.2 KB Created: 2021-06-30 05:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bd32abaac90dd76bd69ec4dc0fc86d42 SHA-1: baf54f6dace6a57cd24479cbea15fceb22eee8f6 SHA-256: 83cb9b1304f23a47b4daa94e3d4be1e253ecb97221c816ba794c7988d5c6d776
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely provides instructions for accessing a password-protected archive, a technique used to bypass security filters. While no scripts were directly extracted, the presence of numerous URLs, some pointing to compromised CMS uploads and link farms, suggests an attempt to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://fnb-concepts.com/images/uploads/files/pevejijuwurede.pdf In PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3ddf0ee0b---figelupomi.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/86135731307.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/28089663473.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac9f4b122f---zubugetidat.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608989cd18366---62709872116.pdfIn PDF document text
    • https://kuepancong.com/contents//files/gumatidazavita.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/65840058452.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aae5421daa6---pinavageratilib.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/d1b115a5187e7390bfb52ff92ffb5688/bugukujeveked.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/c31gbkkhvnkbj47ldiem4ukhae/14646609370.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/fopaganadeloga.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/sejafisanimuxis.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/3548a4e15a6642454c5ff6e634bbb2bc/27508595952.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b674df226cf---dezak.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/kidesudademesesovuz.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608db96cc7f2e---mebavagetazalelis.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/getowofuzulufud.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c994235da74---luxezerakasinumimoj.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d911ec40b85---sogipi.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/nshpfsqhv88iom3lspgn4745c1/92786020129.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb9cfac57f---46750831888.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/jogatoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=free+intro+maker+onlinePDF 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_off0000e43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43D 17220 bytes
SHA-256: 9cf2a79bcce2b63db7cf571e90e51612421474eaed65eb1ca4fa61d12ec33e8d
font_01_sfnt_off00011102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11102 10168 bytes
SHA-256: b8498793e254444fac96a8d0ac0b26ee9c8f94b18c7f5aabb0e5dc1f00121b43
font_02_sfnt_off000127b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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