Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8bd2b7500d14ac2…

MALICIOUS

PDF

74.0 KB Created: 2021-09-02 23:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 540c088d27bc75966c137a3430df4c7a SHA-1: 7e041f39e7e09051f8b7059ddf5faf0b1ab3310f SHA-256: f8bd2b7500d14ac27f710117f20464a22016c4c8b19f826249d5276572519d4b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to potentially compromised or disposable hosting sites, indicative of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest the document is part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://blugarden.eu/file/donaladewuroxi.pdf In PDF document text
    • http://teraval.cz/res/file/87751075814.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/d1b46415ba7b22ea5e1eb8cd2b4b3e27/bitijod.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210801_030944.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/rubibef.pdfIn PDF document text
    • http://e-sportis.com/images/upload/wexitat.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c2791ec45fb---govojanovubu.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/riritivekep.pdfIn PDF document text
    • http://udclassof1968.com/clients/74076/File/gifevasukalemevomu.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7865e4351---41754648765.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/3480da3ab2a8775228e569083adb6a58/zabimikuvotibogasab.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/bimamomuzexodutuli.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c9123e6b8---gikewadedurojofo.pdfIn PDF document text
    • https://egf.tw/test2/images/file/sugozilifobibebodujizobuv.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/74383812589.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/95222902355.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac74382c8b2---fativuwabuwubebo.pdfIn PDF document text
    • http://artospace.com/pics/file/80209325464.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/2301fcc9040f9e1df294d8fec8ae5408/21560398142.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff702c1b2ab---tofiluronimiwetozuno.pdfIn PDF document text
    • http://www.lubin.cerkiew.pl/kalendarz/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=kalendarz+prawos%C5%82awny+2019+rok+pdfPDF 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_off0000bc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC94 16472 bytes
SHA-256: 06d7e8dd9adc1912402d6a4583ae72f4130ad25a7d11d8abb02e3879cd209d5e
font_01_sfnt_off0000e640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE640 11176 bytes
SHA-256: d2925122d93d732e0bd1f53fd50c986febe1cc81b05e19d6864cbd3d81e59db5
font_02_sfnt_off000100ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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