Malicious PDF — malware analysis report

Static analysis result for SHA-256 0305d47cf182c714…

MALICIOUS

PDF

80.9 KB Created: 2021-09-16 10:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f1f53c53cfece5bf8c4b5330e53a927 SHA-1: d21df2c64de3796560fd4c7a57abb7bf364991c8 SHA-256: 0305d47cf182c7147ab2d36d73155d0b040ef9f8d679e64dd30098045eb85a02
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the conclusion that the PDF is used to direct users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://catamma.ru/uplcv?utm_term=raja+hindustani+full+movie+hd+480p+download+mp4
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/6ae4161278f238c930d728fed234f414/5629098424.pdf
    • http://mvdeastudio.it/userfiles/files/19605112212.pdf
    • http://www.medicellbank.com/userfiles/files/76333234025.pdf
    • https://lecourbe.dk/userfiles/file/rojopezukane.pdf
    • https://maintogelonline2.org/contents/files/finivapalebomidelekuj.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ddd569519---kabenene.pdf
    • https://h1t-urlaurora1-turbo.com/contents/files/23121218169.pdf
    • https://novitas.ro/files/fetakojodupi.pdf
    • http://chingyi.tw/userfiles/files/tezuxad.pdf
    • https://www.alapan.org/fckimages/file/riveveveluziwelo.pdf
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/dinobofaratod.pdf
    • http://duocthientam.com/uploads/ckfinder/files/29308208416.pdf
    • http://nhasachconggiao.com/luutru/files/43469628714.pdf
    • https://www.domosystem.gr/ckfinder/userfiles/files/nesonemeruzinik.pdf
    • http://www.naraihillgolf.com/admin/userfiles/file/60800031270.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/b94b02492598e67bf680599a472549d2/durowijipisa.pdf
    • http://dwornawodzie.pl/userfiles/file/baxewomuxar.pdf
    • http://newworldss.com/uploads/file/lavuzejiwaxijuroruwazaru.pdf
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/pisusudurujofuvosudemega.pdf
    • https://bbox.ru/images/shared/file/29702196356.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/e5f573262785d285ef9bc6b1adf3fa1d/jewipumevi.pdf
    • http://smolninskayahotel.com/userfiles/file/33843188191.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cea6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA6 16792 bytes
font_01_sfnt_off0000e6bd.bin
0d17ef76375cebed2a851eaae84db8f25ae62c403faf3072c33494af95d93ab6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BD 11496 bytes
font_02_sfnt_off000101cd.bin
0ca057a6c6804d4e5b44016e6368bc55d62a5fd65c9b12266d2d5053fccd014b
pdf-font-stream PDF embedded font (sfnt) at offset 0x101CD 19140 bytes