Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ab117d9fb31ad2…

MALICIOUS

PDF

87.4 KB Created: 2021-09-03 17:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a24cd31eef17c11a5a5ec3e00086a65d SHA-1: 306c72e3e450926bfd2fc70984537979973608cd SHA-256: d5ab117d9fb31ad238b20b17ff1e564b93e8d1981c4eab0da6935bb6799d1089
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload storage and disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy to disguise malicious links within seemingly legitimate content, likely for phishing or malware distribution. While no scripts were extracted, the presence of many external URIs suggests the document's primary function is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=endocrine+system+exam+questions+pdf PDF link annotation
    • http://etalentlink.com/uploadfile/file///2021080704321168.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/55483154420.pdfIn PDF document text
    • https://vieclambanhang247.com/upload/files/94947537028.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/65953650187.pdfIn PDF document text
    • http://gekon.net/userfiles/file/42057408654.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/48946426928.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/bc5bc9ae34a4731bc6d347aa7a85847b/womuzi.pdfIn PDF document text
    • http://hibertek.com/image/files/20210831_195837.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094101a35474---vaxubaputevixisojawip.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/sotawu.pdfIn PDF document text
    • http://yuha.be/_files/file/napiri.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/28163907577.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/iurp5503cgkaipcmpt36536peb/sonas.pdfIn PDF document text
    • http://coalcreekcentenary.com/clients/5/52/52f735e63eff8706e1a2a73a20aef632/File/vomafotezolu.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/madoteseludilutumi.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/89748224698.pdfIn PDF document text
    • http://szpk.hu/_user/file/39541883796.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/001026319d9749a41d03f98956c77387/gijewigagebewejurakosize.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cf9e30b1bd8bd303e17ed2353d919fdb/4524992642.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/merisapobanakofawe.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ri6jv6guuusukj1o0v3sc40aj5/pisobesinoputigukedon.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/zogowojezidevod.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7bac6f9f1---faxobusufurubemiwelisa.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/98557537876.pdfIn PDF document text
    • https://etadelloro.it/images/file/54729344235.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_off0000ee24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001063b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063B 11180 bytes
SHA-256: 96aa5070291933376c695fb79547c0d007ec5a11a97526859b0e063c1d6c0953
font_02_sfnt_off00012030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12030 18480 bytes
SHA-256: 2845bfa51fb0b0351b9c38736a31746b4e0b193871d2881258b6eed09a98a8c7

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