Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5a40c9a87ca953…

MALICIOUS

PDF

99.4 KB Created: 2021-07-18 11:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3f23338ffbd795d2b2c7180db07b6a67 SHA-1: dae13003b5adce2c8c28f29cae1b71d38debb6e8 SHA-256: bf5a40c9a87ca95397e4baa2532f9e58d5a3c52f071fe4dcbfe04fb2a579ba18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/ktukjj6jbi0psl18p2cbjrq0r6/96383801463.pdf In PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160acc68445556---tuxafomuwasazofulukibixug.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160796322479d6---dovutome.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/d611064940c840ca1cbaacd2d18cd984/24602927844.pdfIn PDF document text
    • https://o-dance.com/upload/files/62063919147.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/95842698481.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/dujuvinolekamukibobiju.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/sepibufulonusufo.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776eeb0b17b---ditajomijanukebexifak.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/zevupas.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/h68fvvcms9h5lpb1pvtrvvucup/83774555894.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/11810055095.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/c3e9171da0110b6fdd6187731e86e413/mepedunagigiwo.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210715_235925.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/1b9daab02f4146492d21e63b63a97f91/merezobajezijetu.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/rusekigemipawa.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/801d6924cb144ad13308ab66da7cebcd/mamikamivifamumawusi.pdfIn PDF document text
    • https://network-italia.com/file/48232286822.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c0760bfb2---kerabumosudevu.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608729a9ef6e4---xefuv.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/radaziluxapo.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/ff8154ad66acbcae52938bde09117aaf/63744762693.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/1d012a6184543f2176bbcdf923af7b2c/54691740399.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/perekexanukabasopewuroz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=intestinal+perforation+in+catsPDF 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_off0001215c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215C 17296 bytes
SHA-256: a5ac0916ae3f05ada85f5ed9fbf7c8689e665398908303769068a4a20aad2a96
font_01_sfnt_off00014ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000166db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166DB 10424 bytes
SHA-256: d2edcd448e2ec9348b23d604b6f79adf1bd40ffa1572a5959b4743635733bfe9

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