Malicious PDF — malware analysis report

Static analysis result for SHA-256 80521c3a4e87cad5…

MALICIOUS

PDF

89.6 KB Created: 2021-07-02 21:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8f9a8105a3981058ef63017d63c5cb4c SHA-1: d9f6b87f4a21426ba0648ded20f46dd52d1f5364 SHA-256: 80521c3a4e87cad5b2d9e53f743a6a0e8cb2eca1fb2a7a3d2adf98b1e79e7438
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites, many of which host other PDF files. This structure strongly suggests a link farm designed to distribute malicious content or lead users to phishing pages. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dbad9271f---ladixakapubi.pdf In PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/79a3ca3869bcba98ef686f0767384e2d/refajaju.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607741218fa30---jufududefizidepajen.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d19a0b8978d---8906434175.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0e1bc791f---dunirugumozovuvonibulet.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6d9b1efa7---modajorepegebakaru.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/14279057120.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/80238958187.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a9e42f0bc---pamilovetinajexerololuj.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b25974eee---kabowadozavajiwafamejib.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/73465823537.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/a84b4cbfd8f2ce939c5f68530bdceeb2/gafupupebivobusi.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5dc4d0d1a5---sefosupuvusexasoxovo.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/571b6fa699595d0ce915f57432f9eeb7/pifusatazizaxofekafa.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/7adf11hc3rcr63jen3jsot71v8/jivam.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607145ab66efe---suteragepebinukumujidi.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/64734040615.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b35a1fb4b7b---35652469935.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ab62dac1e---vifinisosonovira.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/83693969902.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084279e71886---89631731576.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607749229ef86---26581431838.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160703a719307b---zixogizaragi.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/3in4buieo684ho045sekk6uqh5/meromutawose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=largest+3+digit+no+divisible+by+7PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3B 10920 bytes
SHA-256: 7a4d6015371504908eba8b2fa31ecf1083554959612b9ff47720287c0c20a708
font_01_sfnt_off0000f687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF687 19860 bytes
SHA-256: cf4b9b3d28aa565e1d01387d7e9a03ea8c590253e225dffec71305aebe0fb04f
font_02_sfnt_off00012910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12910 16156 bytes
SHA-256: 15bdb3869d8d4458aad361551f68459b5691bbaf699be9bec01cb82de0a2cecd
font_03_sfnt_off00013e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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