Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb0164f2bfbc0df1…

MALICIOUS

PDF

85.4 KB Created: 2021-09-04 16:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1cebfbc6611cf36f165ac13147d14e9e SHA-1: 631349abd3a1f15d308f208fd4f919229f317555 SHA-256: bb0164f2bfbc0df131d70585c3ea4d46606834acc2a636c4aef715e82dc5dda9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to malicious content, potentially for phishing or further malware distribution.

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://allytemp.ru/uplcv?utm_term=the+snows+of+kilimanjaro+short+story+pdf PDF link annotation
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/c247fdd424b9eb014de812548f0082ee/21199828160.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf2dde7a6c---83819920448.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/90980549498.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/18390470278.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/pifiwo.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/a37b17e958dc62339e66a328a7ab27f9/44316367441.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098441bbe6e4---27454477018.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/xexusu.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/xalekeliw.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/nijatusisebij.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a207b9b3aa7---telaxuvewi.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/f302bae035891e936836d9759366647d/tanidunilurul.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/kitedota.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/56005713306.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/fedufab.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/oq2cta1fc1gg9t6ov94sqn0395/70885535943.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611adc62afadb---29673985404.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e86e20918d---sixibug.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/87949685730.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/wivonofomod.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/482814036.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/gitegumilogimaviwele.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/54872698940.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/4447f739ad266347a3407e502627e3a9/bafowotiteb.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_off0000e843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE843 17872 bytes
SHA-256: fb22bbc68a71407ca8c0fbbdc63a589d95664d4c194f864ea31f1a854031422a
font_01_sfnt_off000115e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E8 11148 bytes
SHA-256: 59b9b14cf9a641d526cf714cd2dce8d050a1525e1b6f49a869b1b0d233c24d0a
font_02_sfnt_off00012fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1