Malicious PDF — malware analysis report

Static analysis result for SHA-256 afddc9f1676751a6…

MALICIOUS

PDF

69.0 KB Created: 2021-10-01 18:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 153e93e4f9a3f71f7faa081aa9ca45b3 SHA-1: c587e0c4807558b752783eb0db7aaab1abcb8f24 SHA-256: afddc9f1676751a67c65459a6ae646c7fe5d6efc78638639a05bc9a67cb7b334
176 Risk Score

Malware Insights

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

The PDF is identified as a phishing lure due to its image-only content and embedded links pointing to potentially compromised websites. The heuristics indicate a link farm strategy, suggesting the document's primary purpose is to redirect users to malicious sites for further exploitation. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a9259ab16---91292462005.pdf In PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/daluxesinad.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613004adcc0a1---99522235353.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210922_5F10854478053FC9.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/mesikilukov.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/md9nhhqa5g8mlmp68eas41qcrc/73985070669.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/91266995507.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/pikefumipalutu.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/hr0jfd64dkh3q9c4krqjsbfsp1/sibinidegizereworesi.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/46810846549.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/redaje.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210910005129.pdfIn PDF document text
    • https://seger.cz/userfiles/file/vufojora.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/fizaru.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/40047203003.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/nexikadu.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/kadidogamufid.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/finasopamozi.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/2c0104a9ec7d6af74774d59e4a6bb71d/wutalolo.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/xogakebata.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-17/20210917010941892175.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/tilawu.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/68609529482.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/nezofetujujakisoxotu.pdfIn PDF document text
    • https://remini.hu/userfiles/file/59244389100.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ce9394a5d---96861831333.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/zoximirupezuxi.pdfIn PDF document text
    • http://nessium.net/userfiles/file/gigaziwagopelabineje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=torrent+sites+for+android+gamesPDF 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_off0000b333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB333 13968 bytes
SHA-256: 44a547e3e213c3faea08813c2a4558e1c934c9f218969db45ded69185485d9b5
font_01_sfnt_off0000d5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CA 10612 bytes
SHA-256: 2856e34fed31e3cd22709fcc9d77ee69a64afbe4899a85bd892b2e6627347d1f
font_02_sfnt_off0000edd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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