Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3422a7f3eb092cf…

MALICIOUS

PDF

75.8 KB Created: 2021-09-06 11:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dd3b0d0f5c915ebc39b6830981308e77 SHA-1: ec074effc0359d71460b1130ac077140142667b1 SHA-256: a3422a7f3eb092cf39e518b1eeb654777c3f63f687ac387e00c4b85a44e05b8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or phishing pages. The presence of external URIs and link farm heuristics suggests the primary goal is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=soccer+training+program+for+beginners+pdf PDF link annotation
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/26399054537.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfec7ee4aa9---zadilojozawixeb.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/pitududekupusajofu.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be753f36292---wigopujikufoxisub.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/mafopum.pdfIn PDF document text
    • https://cubic.is/userfiles/file/jejamoxog.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe42a7b20c6---niwupapuron.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072f1f6208f3---80339332339.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/99558520761.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/b47ae384a66fedce2a28759ba51d01da/27861850884.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/guxogidejumominu.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/dusebufaga.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/jugepibi.pdfIn PDF document text
    • http://shophouse.info/images/files/21563601838.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/vodilawadumalate.pdfIn PDF document text
    • https://nhakhoaanphuoc.vn/uploads/files/rovezomoni.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/5bf388d7e67c898382c2d1de606d9c4b/gebol.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/gubagivatagoma.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128dcba87e60---36684747153.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/rumulosogifemolagev.pdfIn PDF document text
    • http://amandamaitland.com/images/file/31471740578.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/32793299325.pdfIn PDF document text
    • http://master-vin.ru/files/file/37324858.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d71196fc6---64573084694.pdfIn PDF document text
    • 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_off0000c6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E0 11132 bytes
SHA-256: 2f52de12ef6f6ac4ea9522fd293f5eeeac64feaa32673af5487f2ecc0e4a7b72
font_01_sfnt_off0000e06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87C 15932 bytes
SHA-256: 012f35b4dd08c1c3067d9a9fd8a9475736d9666206f4ab5fcfbf5b65f2a68779

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