Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d42774201c9649…

MALICIOUS

PDF

99.7 KB Created: 2021-06-29 02:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: be127294f04fa125505ea42ccbdfb3e5 SHA-1: ff2e3c2547886fbf1b2acee4bb514937de63d4c0 SHA-256: 61d42774201c9649a2ab7d89305982e25a40f60e5ef33d3d4ab778c521608692
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many of which point to compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and compromised CMS upload links suggests an attempt to leverage these to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 http://alexanderkanevskyartistbiography.com/clientMedia/file/zatekexud.pdf In PDF document text
    • https://campermagazine.tv/public/file/27280921991.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939f457a98c---80272261143.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/83355410.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/00243095cbdd935e8efabf3693eba3ab/revudebekolazi.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/2f52b520afa338aafd826ad0efacceff/3659977686.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/6ca53a489650237b1cc062164e764a00/27525859205.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/puwanekokakimopibutonute.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/i29s2b1sla6r46j5hdh7rk7u2c/jalimot.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/bed51ebf4ad24cfaf2e7dad08cd8dc44/3973323317.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/83090576002.pdfIn PDF document text
    • http://asiajitu.com/contents//files/99154657382.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/14266668641.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/s04o0k9gege1p11jedjvmqmrn2/21055255541.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/bakafeva.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2fdabab0a---zukufunubiwegekibifinu.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094a04827cb4---924429708.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/46788fd6be321810c362cfa131864a32/21131863379.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e97a3defd---47831732549.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/wixuxedalipi.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/c2bfe6fa2ae99852c2865e0bf6596256/39517260844.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/rjhskjkt2bncdt7lhep49crbci/25371505308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=solid+waste+management+for+sustainable+society+mcqPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/8635c6d0b8ba387de20913589487a9e3/50464782014.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E92 11480 bytes
SHA-256: 0baf0e2d502fdcfba4d8f1f59c55e1e9b3d10b1f5260d38ec1f013e312d1f0f0
font_01_sfnt_off0001393e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393E 17552 bytes
SHA-256: a6376d08bde7b80e749af76108773f3c7cfce4ac51c4e8740ac3da60efa471f5
font_02_sfnt_off00016765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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