Malicious PDF — malware analysis report

Static analysis result for SHA-256 774bf12aaffb60f8…

MALICIOUS

PDF

81.8 KB Created: 2021-08-19 18:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5f73cf6f3b9bcf7cd26a42ded87721b4 SHA-1: 58fb87fa7fdbb5dae11019996e1e281ca74196d5 SHA-256: 774bf12aaffb60f80da437a669b5b1be6ba0b5b13bc658ba72ba53b43f97dbb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://rajskiewakacje.pl/userfiles/file/fanudiluwerabigejifujo.pdf In PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/fozonixixuwigofir.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780fb402f2e---65050765488.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/83506330126.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/25179673195.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b4af3e08a---65368481764.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f820d9f0dec---xuguduxavikojiwozi.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a3738a5ce9f---31099237777.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/341ff755ba92af38cd5635407fad005a/lujasedoxabati.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/27359551007.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084d47d93fa3---56136464100.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/681c169c0b30173e6ede81276b0fb210/mugikozonekaz.pdfIn PDF document text
    • https://isosklo.cz/uploads/pogolikezimiw.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/22227060398.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/36fa0e3d453e90e387c24d21653720bd/xotiravewonomu.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/67581136356.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/rokidinapatebigewos.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c22ee2c6fc6---vodopewogedanulobunije.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/27396779514.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/sanapiwigalina.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/283ff4b3a64095fb8635d3a6f70ce198/dekolasuxovupurub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=avon+bottle+value+guidePDF 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_off0000ded5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E7 16644 bytes
SHA-256: 896b90ab199c02d9f49b359975cf8d6569343925dabccca0cd4ef91bb4f5f701
font_02_sfnt_off0001219f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219F 10440 bytes
SHA-256: 0ce032878e84fde12bae492f117a3c203f1b9c09d4f0248be11a09f4e0b5704d

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