Malicious PDF — malware analysis report

Static analysis result for SHA-256 6872cf8bcf455c59…

MALICIOUS

PDF

90.3 KB Created: 2021-09-06 11:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4d3cb3b7638be12751ff24f27330919e SHA-1: 2574b7f1b1d84c440c0e625689bca5f6a20398ba SHA-256: 6872cf8bcf455c59f02d8e3575990477ccf4e7f8777b6796361ef616ef15e18c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ekbdrive.ru/ckfinder/userfiles/files/80244839675.pdf In PDF document text
    • https://hung168.tw/UserFiles/files/82611406545.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/wiwugikixe.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5754398c23---wapiba.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/73123372543.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/gibuloker.pdfIn PDF document text
    • http://caythuocnam.org/images/files/fokosenixividofefuxa.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/tuvaniwarox.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/gifokirig.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/vubijavavevusugitajusune.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/c5ea5da8cc367157ede270707e5657d1/tidoditavewamaxerewokab.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/51066001599.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/92035316227.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a98bc1273---zasebibuwisabixorojino.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/totevamugizetokidunav.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d654fee58fa---38765215806.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e26cee6455c---fubuwa.pdfIn PDF document text
    • http://realestatemiami.com/userfiles/files/duvas.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/10262747524.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/litoninaverapevil.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff010e3b1a---megilejegoforuzaluveti.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/nejosupifujur.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/zinibij.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/61162986653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=big+data+analytics+tools+comparison+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_off0000fb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB33 17760 bytes
SHA-256: 2c364fb915928aba8b4a70bda7e53d616475e26c132bf51c7ee5c2b59d78db6b
font_01_sfnt_off00012981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12981 11000 bytes
SHA-256: 1437f8003b0cb2553ff977ccbeb88aac17abefc2babf7321cb1aa3996f3c429a
font_02_sfnt_off000142e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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