Malicious PDF — malware analysis report

Static analysis result for SHA-256 efcc5c7cd4a412aa…

MALICIOUS

PDF

89.9 KB Created: 2021-07-06 14:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5170d6d30f748695a027e36b73cb2707 SHA-1: 5b0d059af1d591107f0fa8cbbb44814bbcd1c687 SHA-256: efcc5c7cd4a412aa38f0179fe8cc01d8b89cc11c191180e2b7ae7a8efab759cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of multiple links pointing to compromised CMS upload storage and disposable hosting suggests a link farm designed to distribute malware or lead to phishing sites. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document delivery, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bf51363a925---womajoxuxadiliw.pdf In PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/35772325031.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f931d2a69f---26597423407.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/1dqhomuaisv9v7095k22oqhf6j/bekexavedaxavenomupaduti.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/65691959620.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/kilububizibukoxipixaku.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1622288305.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608019eb3bdbe---76314276183.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/5216127708.pdfIn PDF document text
    • http://termocity.by/pics/files/lanelevabawuxitaweramuno.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082578d29c44---83938407868.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1af5587e52---paparuponisotufemebebaweg.pdfIn PDF document text
    • http://meyras-tourisme.com/ressource/site-image/files/tozufagekopowijut.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/60469095081.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/21478fug9dd746rjvlor46m8e1/rofafopovupikuxima.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c14b75d6de0---kekonekupinuxoragaga.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/94238741741.pdfIn PDF document text
    • http://smn69.com/clients/866038/File/borafinakuxikutobowed.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608536afe08a3---rojanavaditisabimefopapi.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/gowelabegutuwewexoxi.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afab330be46---widiv.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c25dcdc43---gesalisizapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+long+is+flight+to+hawaii+from+chicagoPDF 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_off0000fbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBD 17564 bytes
SHA-256: 4af0c456710809a6993fe9dbfdbdbdb5c2aa48c705c77a0ca959ea199556e9b7
font_01_sfnt_off000129ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14204 10728 bytes
SHA-256: 3ce7556bf6ecaac56807705c798df24d6825e6ef010c65df307b9064591e3f73

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