Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a1681e168b2202…

MALICIOUS

PDF

88.6 KB Created: 2021-09-19 11:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d34308c907fc24a010708fd04ba1611a SHA-1: bcbdc01c34872021cdcbff2e1932ba740bc6801f SHA-256: f9a1681e168b2202ae4718a1f91cdfec0c9a9390c1a47165341a040617793afe
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://crysiq.ru/uplcv?utm_term=how+to+play+music+continuously+on+android+phone PDF link annotation
    • http://freetourscadiz.com/ckfinder/userfiles/files/forosut.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5afe31beb---rumubo.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/47821197618.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109152204136856.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/tadaruvetabiselogibon.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161456be7457a7---sinosepuguruv.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/rimopaligene.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7c9662dd3---kojulofaguboxatefafuzu.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/wifogisila.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/penunifumawezit.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/57847772259.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/75933614864.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/0781183cde7f040052549681579451df/lorelemutarilaponomelanuk.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rokinerugit.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16145d9a208bbe---59765194928.pdfIn PDF document text
    • https://baglab.pl/galeria/file/fenulidikimeluz.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/9081691760.pdfIn PDF document text
    • http://liyangah.com/Upload/file/45778761718.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/tujuziz.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/peledogepudomi.pdfIn PDF document text
    • http://warehousetraining.ie/images/41137332175.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/kotevet.pdfIn PDF document text
    • https://davnosti.ru/upload/kabemenafixagetawofi.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/mebuvopim.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/zofaro.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/modoradexu.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_off0000f37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37F 18020 bytes
SHA-256: b68cfd807a762cebd796266be91e676ec793cab21539824385aba4ba70112204
font_01_sfnt_off00012279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12279 11072 bytes
SHA-256: 1a792d4a5cd481da6a580cda80312629160dc7dbb54154b3018006c2f845dc67
font_02_sfnt_off00013c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1