Malicious PDF — malware analysis report

Static analysis result for SHA-256 1405ecc97c6e39ef…

MALICIOUS

PDF

94.5 KB Created: 2021-07-25 01:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0a860c94ddecce5c3fdf8aa51f4893f2 SHA-1: 326e13420700095cc7764a67c39411f9a8c0d274 SHA-256: 1405ecc97c6e39efc69e645928593f2728787dd96d2d82df46a9f84c3a24f63d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's part of a phishing campaign. The document body, though heavily obfuscated, contains elements that, combined with the heuristics, indicate a lure for payment or invoice-related scams. No scripts were extracted, but the presence of numerous links to potentially malicious PDF files suggests a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/idd4rfq1n812s86sif3mpq40t5/kulaginaf.pdf In PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/hvjhj130r9m765b68gf8et6gjg/62266420477.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/2tco3nt365co9dml8kns6h35o7/98763927028.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/r8108v4eeavn89milli5kukri6/vixefutowiguj.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca21cca5d---lekabi.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f015b974d---tabobaduperufudepiri.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/kifunepon.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/botaseso.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/571a86d3482d5b55c4f29147402a62e4/23117086328.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160746fd5de266---tovipaki.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/sosanupaduzaxotelelude.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24cdaaafa1---65412828890.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/semupuliduneloj.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/sixixupasovutokoden.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/tikazanujutipolimetefe.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a1b582609---wekipisanifalabizebumew.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/78b08e96d6909e2ada4a8bf0b982afe1/jekasuvarotixetofo.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/0lhh6p6v34qbokn0tkpga030t7/53841857777.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/81080686410.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/4169596068.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724322454d0---62491426750.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/c4aeb79bb1190a6a7702735a0fc9e528/12456938328.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/mekiwejubiwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+start+cash+envelope+systemPDF 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_off00010ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA4 17348 bytes
SHA-256: 1a968b390e8fcbea37f4f2e21b1bb662d7d7a6971b76f90028ccb7ef42a4e8dd
font_01_sfnt_off0001395a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1395A 10804 bytes
SHA-256: 6a816df71238649e3af6598d20cc74e9b1e368302fbc4dfff9b89cefda43784b
font_02_sfnt_off0001522a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1522A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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