Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8e956d4b40c2b8…

MALICIOUS

PDF

96.6 KB Created: 2021-07-09 15:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c38dfbaaf48741b68eb985b394784cc SHA-1: ccea28b95fe0876d71cd7392c15b18e7a731e9ac SHA-256: 9f8e956d4b40c2b8271ea601cf815978a57be320bfd9151bbc8bd74798dd7a8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites and link farms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content indicate it is designed to redirect users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oniceh.ru/uplcv?utm_term=fever+from+2+days
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b8ad22690---42893985661.pdf
    • https://barcelonacentromedico.es/files/galeria/files/bilidaginarodapi.pdf
    • http://ackerviewguesthouse.com/userfiles/file/voxufumubukamobewudu.pdf
    • http://bjbtrh.com/files/pic/file/23210820011.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081720389036---waxixevituxilizug.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/1c04b4736d82f91663339ba711306b0c/67475854468.pdf
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/48803188474.pdf
    • https://777mto.org/contents//files/tijidanop.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/967c0149a938b7f2d0bb025b4842ae0b/lumofaguzajutowas.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608dee4c261ac---tebuzibisep.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160731178017a0---dovulodaxaboso.pdf
    • http://alrehabourhome.com/userfiles/files/niwevarawo.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/6764b19c0ba3174f88de018755f247c8/32793690115.pdf
    • https://ghnservizi.com/file/wegataperinuweji.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be911c1cf47---sujorudiziwegin.pdf
    • https://binarbaidrealestate.com/public_html/userfiles/file/ganesolinirot.pdf
    • http://maplewoodmachine.com/clients/1/17/17f0ea2532424b9b8bf99baf53cd3763/File/naxule.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6faaad5e867b9492bb6dc5015e792b9c/19811460880.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/7m5n2vgif4qks2nov9dtnrmcn0/25233750033.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074701d1ce73---wirulezerogu.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e018abb0ba7---3882499656.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1aae71ca0---gipamidirop.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/f90c6c77f169bab3183f4056696bccfc/gufiluvafupijokiwez.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011935.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11935 16792 bytes
font_01_sfnt_off0001314c.bin
56410b8d0eb8dba7d911ac44aa58773c26ea71b1f26d2b4a1d3c281743d45e02
pdf-font-stream PDF embedded font (sfnt) at offset 0x1314C 10452 bytes
font_02_sfnt_off00014925.bin
7d544bd486af8d5674bf6122902a24cefdbf2af629fec4a35b035dbdd9510614
pdf-font-stream PDF embedded font (sfnt) at offset 0x14925 17000 bytes