Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e4a5aedbe130688…

MALICIOUS

PDF

95.9 KB Created: 2021-08-09 16:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 34e62bda000fa06181090de79270edd4 SHA-1: eb4b11e2884512434c2c29688f08072838a0647f SHA-256: 5e4a5aedbe13068811edffd67edb37a0f98ecb02dcae69643ef6f012d5d1a6b5
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to PDF files hosted on compromised websites. The presence of these links and the overall structure strongly suggest an attempt to lure users into downloading further malicious content or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://carcable-bg.com/uploads/pictures/files/ritusijululeripovaxesuk.pdf In PDF document text
    • http://pogservice.ru/userfiles/file/12914658468.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/c04ed666a31ff3184e0783c228c0c0ee/sukugegitakepemun.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/5ejsulqvvnlkit43cji58jhbh0/57285405290.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/79358639144.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/zefolufamakaretul.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/bijopabi.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/990cb5196a062cd227b4c63989113ead/96808247287.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/c9a9328681e7d318b701fc0ce063d9c0/70946571254.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944940411bc---12026220934.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/dimupup.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210709_ED3695E35D2CD863.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6a9350e6d---82945252327.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/ligib.pdfIn PDF document text
    • https://t2sc.me/userfiles/bonezuzutelo.pdfIn PDF document text
    • http://congtyvima.com/images/Download/kaxelilibaku.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/56041290480.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607485484e6c2---97330261274.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/4803494336.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/vufenisugolo.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/filukikopiwolodenajidoko.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/8f4ad4c42a39eb1ac2bf2ebf2194cd75/95110675575.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ecd3545e972---5318290490.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=grade+9+english+sentence+structure+worksheetsPDF 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_off000110ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AD 18084 bytes
SHA-256: f376311dc70f7b14c305263632c92f4f3f4ab67da9cc425e2dc9851dcf34a2c8
font_01_sfnt_off00014067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14067 11136 bytes
SHA-256: 0f726a916dd3e060ce92c8bf06b7aecaae47b4e5d0ecd59ad4453fa19f6b6106
font_02_sfnt_off00015a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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