Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a616b33d1735051…

MALICIOUS

PDF

83.8 KB Created: 2021-07-19 15:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9e3469b442a1b4a452bb4029195cf191 SHA-1: f94097ead51fd33fe78fca16ce0d3d0b51a2791e SHA-256: 0a616b33d173505115238e7c6306aa796e8d6b53beabaefa4d995ca9fe856553
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to compromised websites, many of which are WordPress installations. These compromised sites appear to host further malicious PDF files, suggesting a multi-stage attack designed to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kodcomputers.ro/2664/uploads/65243924544.pdf In PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1c378eec5---fogugixijejakej.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dabb7e8423b---34476890002.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/hd75kp9lrh5434d6crcj6b2p73/pulub.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160adbda693212---koxulonofiwazuzudujoge.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3c3ae13f2831fc69971a3855f9a88026/5781618666.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/kutitulukexer.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/15667709881.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/99278450609.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607630dcaf1d1---63237359691.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/45313548430.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/62661327173.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/famiwiwaziwerudakojefow.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/wibujosetefego.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/pekuvedawitonosu.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/15708390788.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/ripoxasufo.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/70a4d58e102d23cafd5f282801eaec55/54815778845.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/iqa8os5c6ubh7svvg48jv619c1/75614405817.pdfIn PDF document text
    • http://yjccnc.com/upload/files/3563874724.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9cfbedb9a---zizozevevipazuvaku.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160860922f24a5---69122483925.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160813143041bb---58973414651.pdfIn PDF document text
    • http://kinogigant.com/sadm_files/69390805688.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083df746c6e3---52514839430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=compound+sentences+worksheet+with+answers+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_off0000e3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E1 16708 bytes
SHA-256: bc2eb5240406645f4da7246375f36118a8f6e5d0d8784b8193dca9e201ff61c8
font_01_sfnt_off00010f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F61 11148 bytes
SHA-256: c4cf4c5f945c9430ab56a82cfba5bec69091c8d6465bd8bcaceb48f3ae970099
font_02_sfnt_off0001294f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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