Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c351f061d15d917…

MALICIOUS

PDF

86.4 KB Created: 2021-09-05 04:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a66c354314b3b5fbb727ce0fc406b6ca SHA-1: a0b7ab0d2f07d2e71239bd5977b08553f3e2edc7 SHA-256: 5c351f061d15d917c0a95bbe5abe5b461e23ac687cd9c83f13254710898a0707
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress uploads and other disposable hosting sites, likely to phish for user credentials or distribute further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/qu6hhrhgsjgmuiv5cmk39ui1i1/27278456003.pdf In PDF document text
    • http://yaeram.com/userData/board/file/509881613.pdfIn PDF document text
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/kpvkb98lsphahm4ep2rk21tge0/jilijunupabifokefuxozaw.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16087527f79fda---55260684366.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb5ce95d70---mitojirikovam.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/61498194645.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/7226657484.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/ditadelaxebemada.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/joridudilunudatarodaku.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7bc854aefc---56091577968.pdfIn PDF document text
    • https://shopabrang.com/images/files/gupiputemebonaponukigapi.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/91965458333.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/fhejhjjl9gtkn8fn6p7qmjncua/wupom.pdfIn PDF document text
    • http://ddms.tw/upload/ckfinder_temp/files/20210705074700.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/73221200415.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/64403988278.pdfIn PDF document text
    • http://valeneighbors.com/userimages/lefojeraletimafe.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/banifoniwaxivibovapamefa.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/4rl7btlh9ss2e5d9cdpdaac150/33692395286.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/9555986931.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/45258307070.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611bd3d74a71f---zidoxomilumevinutu.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109050006055601.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210627092820.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=diagramma+di+gantt+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_off0000ea0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10226 10376 bytes
SHA-256: 82fa4815ea82f1fc00eccb4848a67bbd96123ca864c2809f2c041f2c4f196bf6
font_02_sfnt_off00011950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11950 18652 bytes
SHA-256: a4716c050bcd59f2ef5a53f46f4dc67a4d1f4add4ed0b9514585c27ef3cabd2e