Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f293afbcf642fbc…

MALICIOUS

PDF

78.8 KB Created: 2021-09-02 15:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5091954738a3a8d249e76ad599b634c1 SHA-1: 527d74a755347cb76684b78e7f137ad3f526e720 SHA-256: 3f293afbcf642fbce169a7fe9321085eb9828c0a5bf9dd18094f58d689b7bd02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm pointing to compromised websites. The embedded URLs, such as 'https://catamma.ru/uplcv?utm_term=contingency+table+worksheet+pdf', likely serve to redirect users to phishing sites or download further malicious content. No scripts were extracted, but the PDF structure and numerous external links strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=contingency+table+worksheet+pdf PDF link annotation
    • http://aven.su/userfiles/file/93651733118.pdfIn PDF document text
    • https://27061010.com/uploads/files/202108161750385304.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/88487253651.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf7755aabc---tigadatifedelufubaxud.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/pipama.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/10076177874.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a87724c95---wipabufevuve.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109b14de2ab6---92576570679.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/52937592973.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/tabuxegidavegenopasit.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/lapugisaka.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/cd5f2fb07e72bf6c235251e2da80b5e5/51863077059.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7112d0a72---84121704762.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7921e75e6b---rukefog.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/45473245467.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/61438473136.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607627ed35d0f---13901452421.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/44666113910.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ee45d10f601---giratesuwuje.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a29babe8ed8---23555879013.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609294f75cea2---fubuwoparuludam.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/77542416626.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/jalafoduranifavuvagas.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3264bbe6a---24841195334.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/lixovurul.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_off0000cc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC55 17724 bytes
SHA-256: 2f48705c0fe4bc00b47757ffd8f3b3f25cb058f4f50e334ed5962dc55e117fb2
font_01_sfnt_off0000fa9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9F 11364 bytes
SHA-256: e4e6929b85d729ce259b6c57e448c746927a3ee0cefcf7509dab6a2ad702cb10
font_02_sfnt_off0001150d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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