Malicious PDF — malware analysis report

Static analysis result for SHA-256 fffe2c13248b0b59…

MALICIOUS

PDF

90.5 KB Created: 2021-06-29 21:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: debd80c437040790408730d3c78cd989 SHA-1: 0975e64683f5456e48389a88a1663aa791c6252c SHA-256: fffe2c13248b0b59f860db08c7fa5b7817c5ef2ef2537f77ca835cbaa6cb8e0c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics indicate the PDF is a link farm, with many URLs pointing to compromised WordPress upload directories. These links likely serve as lures to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 https://catamma.ru/uplcv?utm_term=late+fall+allergies PDF link annotation
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a832752161---51698450734.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe97da2cc2---8676692065.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/5295849060.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c428945c27---lewijamexepovapiz.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0dffa8dc2---ririlibabumituwona.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/b0a3ef4e471fede58dc98561046edb88/kuvuzoviv.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/kowotapasidenatikobem.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/e9014872afd2b071023f7a4958e732ca/95068246777.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60B21B5B53349.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/8e42e9ee5c7b8b600738c5edd7db2e78/dadogujam.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/letumagobajorupak.pdfIn PDF document text
    • http://dnepropress.net/files/file/ruseduwipel.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f72903ab0---30804843298.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075e01aaebac---59109160241.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/07c9069ef15eade48e54275858f3e7f3/topunabotivajubi.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/79699991035.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/jjoq6qqed2rvr7phfh1cvfobd4/61603793318.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/budatobilanolazotebuti.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///ropubarekupamitulefas.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/fidulorisakizasemirawex.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/45459156172.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/31620132890.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/ccc9c380405ebffed4d7754889dcf5be/mebitilapapapovinananemaz.pdfIn PDF document text
    • 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_off0000ec1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1F 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_01_sfnt_off0001019e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B0 17028 bytes
SHA-256: d983e9c33dda971281773d3f8b781d0e2bedf718d21f71fb339ccdb5abdbad11
font_03_sfnt_off00014610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14610 10124 bytes
SHA-256: d3546b523eba2d4c54c342159ca27b98718eba195e85c63de97f21c2e0a0aa39

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