Malicious PDF — malware analysis report

Static analysis result for SHA-256 c875a251551174ac…

MALICIOUS

PDF

79.0 KB Created: 2021-08-28 11:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5beec238714d0e380b136d28435f8649 SHA-1: 1b3df50ba055a9ffd72e48419d9705346db0b728 SHA-256: c875a251551174ac786653674308575bd89bb51c724abd025fc87a3ac4d64d4e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9518

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://fiberglasssupplydepot.com/userfiles/file/ledelezadusatowujuzafamij.pdf In PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/4r2un2dfuhhlfa13uain6e0c1k/84044643103.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/c2f94b62a11692bb58a6152ff8c531e8/sajogerabidiviga.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/9b454795a2b1c413c25ded632c3e4e59/wagifareluwefugu.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/2181543130.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/77mso4ga447ak2u3tj6q6d3spk/lovozedetawut.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/912c7cd7c6dcf2671400492139d29ab5/vanorifusa.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/pasiwogosamipobiwupiwimis.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608887bbeabdf---wakopafexewevev.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/semimujef.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/45178959724.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/foniwinasajorafuxabej.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/bebinunefurabuzuxukoxu.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bd35b4ae6---nuvajimep.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/zuzawikududemopakitozas.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b059b042f5---5685428682.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/35216869044.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/1basbo8qaokov4uu8kdt1n40p1/39839090718.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/14216435985.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800d028c2fb---bodirubejivulewurimisipu.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e38c9c22a---fufonomexarawodu.pdfIn PDF document text
    • http://techbis.pl/files/file/84202478825.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/48507742508.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb73db7f2f---pumumunulitusenago.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/vewojodibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=i+lost+my+license+cardPDF link annotation
    • 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_off0000da24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA24 10596 bytes
SHA-256: 4f3ba9bfe4f848859c59257a3e5808c84ccac8e74c373c05649830316bcce381
font_01_sfnt_off0000f259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF259 17288 bytes
SHA-256: aed96bf47a43ad72c5180d8f5a29db6aa3000f751b7a759a9aea837ee5c300c2
font_02_sfnt_off00011f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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