Malicious PDF — malware analysis report

Static analysis result for SHA-256 e930fcfe5bb64d04…

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 19:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0f53a48f14cf03c5a658503d287836aa SHA-1: 76c036cd441be57b1536d50cbe01398479fb7a60 SHA-256: e930fcfe5bb64d04fa6b4eed125f0099d62ce915fa98250744f5734048d73622
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a link farm designed to distribute malicious content or manipulate search engine results. The presence of these links and the overall structure indicate a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://siciny.eu/userfiles/file/43529668958.pdf In PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fffc24fcf7---xixojunawinizuvamefoti.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/momigunukumur.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608198270fd4c---21402042118.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/tidupoduxusemivuxefepamug.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a9d4e1a50f6a018c848a508101a379d8/farezuboxuwukofeja.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/jefexufuvi.pdfIn PDF document text
    • http://clintonseniorhighclassof77.com/clients/e/ec/ec6cde7faca09d53f5ba1fe44cd32e38/File/89454856662.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/61922293722.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/3325cd60f7ca85fd5d2709aebc9ab63c/pozikedosofetiki.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/pixiro.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/16951267028.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/ti4ati584hdsg7kpjai12292jq/gutupib.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/39450682183.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/0c5bb760414091cba68dee5b4bd6b8fa/bisor.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/boraduv.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/l5c0akcp2bap7ipo5boaeeodoh/lafoganatovelitivogi.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/us1c27kvaacthibbbc14dlc092/jugikudenawotati.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/a13744af5f952403fcba630c325ecf58/bapupumezenuxowo.pdfIn PDF document text
    • https://unitjaya.com/contents//files/kubibagirosivatikinodep.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/fegawuzokotijadavubilarof.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/p5div6uj6f4o9meevm8v84bmvd/tofokigunosibuxiteg.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/59694830516.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=bissell+pet+stain+eraser+cordless+portable+carpet+cleaner+manualPDF 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_off0000da61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA61 10968 bytes
SHA-256: 206c69d5cb75c310988ee0cff5b016a2d555d1f934a695573c00eb51443e1356
font_01_sfnt_off0000f39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39A 17296 bytes
SHA-256: ba0484b84126dd79ca028139c12fd6654576dc04150c12301af33dc9be7d5d42
font_02_sfnt_off00012052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12052 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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