Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6abc97dd31f759e…

MALICIOUS

PDF

88.2 KB Created: 2021-07-02 23:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 89e258f7119587c9580d71f11c614d94 SHA-1: fd9338936cc9249d91f6be312d6a555d8fd99659 SHA-256: d6abc97dd31f759e5380492a800422f4bcc48831977b7a575fa1fd81ec8b455e
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 a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites. These links likely serve as redirects for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://emotionpicturesfestival.gr/userfiles/file/kegibininirusokojedafijez.pdf In PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ojlpke0gojfa4a282d5hsoc4v5/99871659880.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/d41471e9ede34b65ce5be2363299018c/51601685937.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/5794b6a91df4f8e1585ce3938610b7da/35243892116.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/palozirip.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1608231ad6655d---nexesobuzavixizilemaraf.pdfIn PDF document text
    • http://progetec.org/userfiles/files/3789647968.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/kowuxilarukepoda.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160749a4c28087---jidida.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021051312250452.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/52137592556.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/22731689773.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e64d36753---podilozojopebekena.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/85088989839.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/84493469052.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607caa115ffd8---63147504356.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8243f3305---65290276997.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2f2460d14---98707675978.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/977ec298e0bf1ca147764340dfdab2f4/somisifopod.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/ketanerisutirivus.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/55039002735.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/44920675030.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/j1d4ai10to94u959sub6vh0ev5/89120092042.pdfIn PDF document text
    • https://olterus.com/contents//files/mebines.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=bowling+specials+near+mePDF 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_off0000f2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A5 18504 bytes
SHA-256: 1a2a7a1ed58b73c5bfb2448a8689462829d73b3a44ccbc6d3a40ead3a023df10
font_01_sfnt_off000122f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F9 10760 bytes
SHA-256: 1ceae3ac2fb46f55147f296c9cc7bbfa3f007fb53b83cae59bb24d30542a98d6
font_02_sfnt_off00013bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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