Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2e55d8d65466dd7…

MALICIOUS

PDF

82.4 KB Created: 2021-10-14 14:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9739102a7e5504279d126efadc21f272 SHA-1: fe22607f614882cd53d5e9f3266acd8a587b3975 SHA-256: f2e55d8d65466dd7ed07f71a700a7a75c72abfefbddfa44bf33b1cef259a4269
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised websites hosted on various domains, including those using WordPress upload storage. The presence of numerous external URIs and the nature of the heuristic firings strongly suggest an attempt to distribute malware or phish for credentials.

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 https://coretry.ru/uplcv?utm_term=router+security+types PDF link annotation
    • https://ckv-siemreap.org/ckfinder/userfiles/files/43360420208.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16164eed476557---tajafakowezuxureme.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/xabujevugosoligej.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161557a468c59a---67968481936.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615f0e2fd96bf---34749985445.pdfIn PDF document text
    • http://ortosprendimai.lt/userfiles/file/refonawejaxif.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20211001070857.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/90932278457.pdfIn PDF document text
    • http://watch62.ru/files/files/boxan.pdfIn PDF document text
    • https://on-the-markmarketing.onthemarkmarketing.com/userfiles/file/folon.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/52188458133.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/vizerogizifo.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/gosiwatuxenifilaxudapi.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/72340715428.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/92600129535.pdfIn PDF document text
    • https://ksuskalology.com/images/file/79803702953.pdfIn PDF document text
    • https://cian.hr/userfiles/file/xaginutevefofudosan.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/48514591643.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/86829270603.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/xoduredozumore.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161458d55e5dfe---zumudetalomutadavimog.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/37303730721.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/387d5c6e626a48f874d412e5f2595462/15843940627.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_off0000e0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F5 10312 bytes
SHA-256: a1e9de60bdc7814b40ce14d28d922e25add7aa3bf60d20bea44e1fabdbbb3b7f
font_01_sfnt_off0000f872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF872 16756 bytes
SHA-256: 57573c1b0f2c334efc4b0e1747c56149fce23e40dfd62d22048706bd99bef787
font_02_sfnt_off00012444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12444 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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