Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e076334ab548ca5…

MALICIOUS

PDF

87.6 KB Created: 2021-07-28 13:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4610ba0ffb18619b07d0561a4244b05c SHA-1: 285c63de0d225af579b652126d07ce4a5724cef1 SHA-256: 4e076334ab548ca5a72c91591f8701ff613d2b39d9ca0fbac42a81efb149c427
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an attempt to lure users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://diencohoanghuy.com/media/ftp/file/fotamimelijibegad.pdf In PDF document text
    • http://efuegypt.org/userfiles/file/xuvudo.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/11770926260.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/99cmku7kdjo12uphmphc5v5734/vosefupo.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/abfbed67a2ef0c4743b690dbe1746430/pugugomakar.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/22dcefb3d63f90bc6da5517a9cd15d18/mogagazavaxirumevogabilin.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a236a0a1d59---41602059946.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/niraxaxokexefixusewe.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074f91fc6f55---fofominebenugalar.pdfIn PDF document text
    • https://cristalensi.com/public/File/11485568617.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/sotufepirolawonowexuwepe.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4d8bbac67---gunelozilemivakesese.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ba85db8a8---kisuvurogumas.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/0687b88fd9a0d3dcc67d55d11db0fde7/68247789868.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/41bd5f6040bfe2e7b45501bd93163525/rafomejusizojilif.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/tufixojetavumivodovoxe.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7f20e538d9---visurun.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/44896953460.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/82475156688.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/3b59d4f9af78a9498f55d47a3bbef6d4/20737094406.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=panasonic+profi-haarschneidemaschine+er-1611+silber%2FschwarzPDF 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_off0000ec9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9A 11364 bytes
SHA-256: 6983d8764248f3d7e1a7e4beeb7b0dabf8465d86bc641f2503d4d81baf4d56f0
font_01_sfnt_off00010727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10727 18392 bytes
SHA-256: a48fb72b13fc84e1dfec740fad190c2debb5f193bc3fc7f0d07bc81de7c292ce
font_02_sfnt_off000135b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1