Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b2226ba95169a5…

MALICIOUS

PDF

74.7 KB Created: 2021-09-09 19:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 77e4cd401c007a67e6e17091dec7b8b6 SHA-1: 04d3faebe45e9535420158a7286f8fe6579707c8 SHA-256: 85b2226ba95169a5b8289cfe62ba0bb7993b2a19b6992d886b7c7b22aa362ee3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the interpretation of this PDF as a malicious link aggregator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://crewmak.ru/uplcv?utm_term=block+all+ads+android+no+root PDF link annotation
    • http://mediaworld.pro/ckfinder/userfiles/files/xuforapezexesexedot.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/fekakir.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/rukafaruxexisejib.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/nurowafogivilejelukubes.pdfIn PDF document text
    • https://festacontinua.it/public/file/29242170725.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/4b247877292a0a7edc2618fbdc29a337/barozetigime.pdfIn PDF document text
    • https://shidoremicrosys.com/media/56589591183.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/vunegawibitis.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/dotinepofanosekaguxopo.pdfIn PDF document text
    • https://digicpictures.com/downloads/penimozimijugazazejuguvo.pdfIn PDF document text
    • http://findusafranchise.com/files/files/zimiwonasaxekebawebomadut.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/folulidonaj.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/mebowitavebe.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/e1e7ca072a19e4a6bf36d2359b093372/77585491536.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/nutexomog.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/jimuxajigogixoru.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139dd51b55ed---lujoximirupafewosemozede.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/16902019164.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/63918047970.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/7577923495.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/00871bdc639514c5bc8ac463f817a10e/sukeko.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/ziredokanasimobexi.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/jewefoxetamaxaze.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/vadomopew.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16138e025bf062---mozopizimolajozokewezove.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/22303052702.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/zuxetavatiwoxijokapa.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_off0000c079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC079 17140 bytes
SHA-256: 8807b9ad0f9507145fd68e1ee652f46b282446992951b478b54cc0a4c89194a4
font_01_sfnt_off0000ed1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10534 10376 bytes
SHA-256: 07c8306fef9587351be77647ca4702f2fad912857caf7037845a99796131526a

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