Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a05edb5070eb435…

MALICIOUS

PDF

75.5 KB Created: 2021-09-03 02:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 417dc9d7f01243424c7e5b2deb450d70 SHA-1: 86791e34f2f398e5cb9c19ef794070a57ea6df8b SHA-256: 2a05edb5070eb435aa061267500d8dff1cfda5ad5811c08d6434ba9ebc8a07bb
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or trojan delivery mechanism. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, which likely serve as downloaders for further malicious payloads. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087c5f2bfabd---5794443170.pdf In PDF document text
    • http://chromowane.com/userfiles/file/kepinoku.pdfIn PDF document text
    • http://policylic.com/uploads/files/6969862630.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/03767ed06af3eb5c607746ce365eb134/54924504425.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/45091152558.pdfIn PDF document text
    • http://ingore.cn/upload/files/busokazatibiwi.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/jumunut.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c147d113f---32060417061.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f837e6b66d---48382062939.pdfIn PDF document text
    • https://clove7.com/userfiles/file/varazipapumevikivi.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/7f0c7895e9cd2e104997fe7318d95fb9/87583264510.pdfIn PDF document text
    • http://canadianrockies.info/files/file/xopigajivadeted.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/16546749472.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120063c301cd---66368661587.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/savibasususoganijadaxo.pdfIn PDF document text
    • https://blokhol.com/upload/files/rowojilata.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/fifuzekitidekis.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077bb770f2ef---gobawikalijolet.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16102e06c4a998---migupadebupezetu.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/4c9eb434bece6d047bedb4f900d15ab7/1696994547.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/budigapu.pdfIn PDF document text
    • https://projetovm.com/uploads/files/83811131421.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=6+kalimas+in+english+pdfPDF 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_off0000bf99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B0 10792 bytes
SHA-256: 79534492cf453ee3d4ba8b0fc59ba963e44f64de2660075b402b8b64deded1f2
font_02_sfnt_off0000f00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00D 18568 bytes
SHA-256: 7f4580287ecf900a13315bc4f4b2413b2353733f26c933564738b0995717b44e

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