Malicious PDF — malware analysis report

Static analysis result for SHA-256 c374b4aa4ef4241c…

MALICIOUS

PDF

82.4 KB Created: 2021-09-05 18:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7bfb2c79a063f23dab608170cf5dea15 SHA-1: 99b8cda9fd13be2580d596afe550ec2fc1af4848 SHA-256: c374b4aa4ef4241c386c39ea4486f90572092eeb9ad6680d33a84b52b3bd6224
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade gateway security. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://wastran.ru/uplcv?utm_term=how+to+remove+password+protection+from+pdf+using+adobe+acrobat PDF link annotation
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/a936d63375e2841f26c0ba66edd7aa74/53698276414.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/fofenoridageda.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/nojetepabuzevuli.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1753d7654b---zuzezapopoweme.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/ligamivaguwof.pdfIn PDF document text
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/2b8d89480ff03c0834ad175ae5488540/98064520939.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/e4664f3654b652744c31d938b2ca0b32/21703585939.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/xubiru.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/xunufuwakomuta.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/zitipurimunenuxidowera.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/4008fba22a9e91e4ba96ac1a4193b828/57870030877.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160704eeeecd7c---17189436529.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/pifofaxonapiwaroputekutaf.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/37289775630.pdfIn PDF document text
    • http://termocity.by/pics/files/42517059592.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/66999778879.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/64929836256.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202108220408198871.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/22904362578.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/23089448439.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/78c8b439e7d940bbfdbdbd9f1860ff32/50315152751.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/ginapizegupebimupome.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16114c695b6e85---3111493401.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ts3so04v9dcj5s93qgh0i98c36/64942019305.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/79010144877.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_off0000dabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D2 11300 bytes
SHA-256: b5733c0081bc639fc76ab02e607e3e9c1b7689b8f1c01563fca5d36ca8dc6a11
font_02_sfnt_off00010cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFE 18028 bytes
SHA-256: 0d297724a8300390ccd07c501fd0b0563264ad2c48ff6aca320bad9763b21b73