Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5fbf53063b19834…

MALICIOUS

PDF

102.4 KB Created: 2021-09-04 17:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7009f68b56c465eede47a8fed1521532 SHA-1: e662248791c816f458ead04e1c7c13b5a3893451 SHA-256: e5fbf53063b198346cd4ede43e32e68f6720be6f05905a6cb2136ee6be44db0d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to potentially compromised WordPress sites or other disposable hosting. The primary goal appears to be directing users to these external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://foodchemsino.com/d/files/90419674492.pdf In PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/rujexananuke.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/d7f1f14bc19b0ba136a772a82c95357e/tizovubimowotewunane.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c014f04346d---wafaduritezatujuxeluluvo.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/773719cf59beb4fbd5ed7e3027224559/telotosogexoj.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/cc6693bac9f3854ee200d4debfbbf884/labipojojazesopigovo.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/kaxadoxudetimosenowenu.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/mkjqopq743do5d8v9n8v94pl04/65971221959.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/40393615480.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/11050180514.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/xujorugezixa.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/29393960935.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/78778764969.pdfIn PDF document text
    • http://koala-al.com/d/files/xipafixuragapujusesibit.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e30c2a7dd2---32866527752.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/32863784100.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2adc0ac19c---19272205174.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/17860964968.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/082e7emdav3a6i4949v888s30m/79545319414.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/69701276631.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/2ca2717b03d7e7757ef6bd7fc6303550/92944889344.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16102d2e00cfcb---patugozujixila.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be08943ac6d---40500745781.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/65380816096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=explanatory+case+study+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_off00012bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF4 10820 bytes
SHA-256: a9a3aa3b6b205a24283b083755747cd88c4f202e2a3b2ead896cf6440e514015
font_01_sfnt_off00014526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14526 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D38 18004 bytes
SHA-256: bb8ef4d9efc9bac3b3d5e3d40a88c6209e2742d497a4778b6b0caff31c24611a

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