Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e7a3bf2e9014572…

MALICIOUS

PDF

71.9 KB Created: 2021-09-16 22:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 14ffb91165a2021049b739f2c16fdb6b SHA-1: 2d47c5eb5e5e7e60b199a9be291a445a2effbead SHA-256: 4e7a3bf2e9014572175cd26083f110b996897147a5df06a831bf8d2d501cd87f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL findings point to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mywayrtk.org/userfiles/file/dukufasegexibepebok.pdf In PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/53auiu7gik7ucni60riho5t6s9/22127245970.pdfIn PDF document text
    • https://matratva.in/userfiles/file/jilinukamam.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/benixatudem.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/51931364274.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/75563748352.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/96804876420.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/77499483801.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/39144144869.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/vuvaduvujigoxagemesi.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bbfb17102---47311450513.pdfIn PDF document text
    • http://dentali.cz/files/files/jizix.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/30660249383.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/78762332036.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cd3101382---2277964282.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/51907882668.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/48140328678.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/woderisujidejogi.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/ea40dbbed1a0fa18937219260f7585e8/komekurapu.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/8eb75b81aa75b6df530ea59d4d751d72/kefikigurafizikan.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/fovomejotojedebu.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/sopotedavawixepuweruwu.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/paniwovimazelugar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=tubemate+for+android+tvPDF 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_off0000b77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB77B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8D 16596 bytes
SHA-256: 944e85fced175aa2d097c9b0f404f3998067cdc60a39236ccd4778120bf8179a
font_02_sfnt_off0000fa5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5F 10572 bytes
SHA-256: 87da5b5aeab0d077f8f7901d9ac66abb6230a993fe553cde7db78c1644ca64f1

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