Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac47ed39dccbb44…

MALICIOUS

PDF

87.0 KB Created: 2021-08-10 16:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 1f598992c55906e12661865bf76d8d57 SHA-1: 0fbe2ec3c6d290251a0acb5a490ede1c61dc7a2e SHA-256: 0ac47ed39dccbb446107a99e94458f890c18bd08c1a396db271200570192e4cd
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://wastran.ru/uplcv?utm_term=logitech+webcam+driver+hd+720p+free+download PDF link annotation
    • https://masihpt1.com/contents//files/fifodotosuxo.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845787a3487---madodavuxexisokofupaf.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/salejaralebipowifuzobad.pdfIn PDF document text
    • https://retta-bg.com/userfiles/27869873797.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16070e51767979---74170955198.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/74035955d9cd8fade8b2850be749e67d/23465169181.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aff9ffb6d10---giginatamomeletovi.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832edf29dc9---37756253006.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57f9a4f598---62653460670.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8a45c2f8a---97042828670.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/55666930728.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/9a07467c8d8b16326d68153aca254b1c/tusodi.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/zasukamosesitewadibifo.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/komefupaginupibu.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/28131987475.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dutipodubidogabebu.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/53281720838.pdfIn PDF document text
    • http://lalinpress.com/ckfinder/userfiles/files/76250047865.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/eea51220b53e9625b36d31205ba231ca/sobiboma.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc74d779a0---61556091831.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c930705fa5c---judurivamisarese.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607312ece2276---1927542481.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161107a5ac7719---78741097730.pdfIn PDF document text
    • http://langmypham.com/luutru/files/nedirozixarebewugumamulun.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_off0000ee0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0D 17064 bytes
SHA-256: 4793755c01c6742dca6aad35f34c8052cf6062e4e5a9f243dc60418b222e2d5d
font_01_sfnt_off00011ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE7 11440 bytes
SHA-256: 123fcab6035de71080fadab2f1c011205b60c1546923cfe5a4aa2f4752473655
font_02_sfnt_off00013573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13573 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1