Malicious PDF — malware analysis report

Static analysis result for SHA-256 900e27de85341c5f…

MALICIOUS

PDF

81.4 KB Created: 2021-07-05 21:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8d64dd799432de002d34829ae2f4f53c SHA-1: 6008a0e93e4be0bcbdff9baa3a7be01d9a26b540 SHA-256: 900e27de85341c5f5a2f54abb9a9b8507308b258cb09c238b2147eebcb949455
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous links to external websites, many hosted on compromised CMS upload directories, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate the document is intended to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://philabc.ru/uplcv?utm_term=what+is+the+requirement+for+a+manual+water+pump PDF link annotation
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a159de6d4---32441555858.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/zixuleg.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/h1o657c9qmfqkurfucvbblp8f3/vuzoragexulasiboxepeful.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bf4162b08ee---wubamilijumudozapa.pdfIn PDF document text
    • https://egf.tw/test2/images/file/pobudurupovagufif.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/hufh8v3kgrctmi2dvhlqq18ue7/13181614376.pdfIn PDF document text
    • https://digireg.org/upload/80398201390.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607de31ef0847---93887676291.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/22d0fd03bb2d9bf843826d042ac97f6d/38700617512.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace29133072---63207774092.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4967dd03c---95877246157.pdfIn PDF document text
    • http://vhktn.at/images/content/files/zifosilikewibalitu.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/4f9fe91dcb432713283de7fcf4cafd86/monenidevatuluwon.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/2sopv7v7lca4id4bqg4oes3800/ruzexipexigudifu.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/polinewutukalapum.pdfIn PDF document text
    • https://soechi.id/userfiles/file/wekotewep.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/dagekigew.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/22937824844.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/petanezufufinokox.pdfIn PDF document text
    • http://candientushinko.com/images/file/5394742723.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d384c53b08---mabiziropasebopoxuwuxu.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/tolufuxodujegadotofuva.pdfIn PDF document text
    • https://polandpools.com/contents//files/rutasipuvimenaxafodik.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_off0000de77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE77 10948 bytes
SHA-256: 26df0e5179a633b1f7dba4632964ed256a6cb8b4c1655419f17008b2720358ef
font_01_sfnt_off0000f7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BC 15740 bytes
SHA-256: 119e6ee4c86324ee3a26465aa148eef7c44e11afbb13c25d9c85204e9eb9d7a7
font_02_sfnt_off00012034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12034 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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