Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4a6fae7f92709f…

MALICIOUS

PDF

105.1 KB Created: 2021-07-25 00:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e1875eba6faf012a358f6aec0a53189f SHA-1: 1ea7afb359415c52f73f63164631274d0970ce89 SHA-256: 7d4a6fae7f92709f3122f02f3e0c3b43add80a381b1fd252e3902c38e901156b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9858

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 http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ae6c0d311---75259105040.pdf In PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e324d03d338---taxegudilizepanebefiwi.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/soranrmq7c1idsprvsu0r4dq7i/97942236200.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/lufeberulojoradibukevojo.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/35261181913.pdfIn PDF document text
    • http://hydrem.ru/images/file/488414146.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/24370484350.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/96637948514.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/b254f3423d50d7cf18908fa993d9a2f2/panozuzufodoxurumeto.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/vuzukilisedevixunit.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95a9f40089---fogijadulalodideruko.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8c73333a8---83845658413.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/fipawotosuzanis.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608256b2c8424---fubifinatoketewomevovati.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bff378f12ec---busobagox.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/045a1dce37857fdecde987506e97b2bb/kawod.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/ruwelidonikalegujuxebuvad.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/81838809719.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2b52b1c3f---temezejimubijijikexivuki.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3cbc19c477---57083101973.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/51871828005.pdfIn PDF document text
    • http://ladakhtripmaker.com/userfiles/files/liresu.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c15fc79ef69---jalojevi.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/zokibunezuvifitewedesi.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/d08fa6a72f410f87dd6efe3b457ae142/77178244947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=familiars+guide+mod+1.+12.+2.1PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001375d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375D 10704 bytes
SHA-256: 0e619d9bebc3813b404dd5be528943adb5b136da2c9401af8cae124f1e079466
font_02_sfnt_off00014fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FB8 16064 bytes
SHA-256: a013ce2342554bbd70a9f85285a6053b67e9b25eaba0dd22223cc179b1b1ea16
font_03_sfnt_off000164c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164C8 17876 bytes
SHA-256: 14635c941df328db2c5d8e18eb472bcb2a8d67ffe3a04160f52083c3a11b649e

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