Malicious PDF — malware analysis report

Static analysis result for SHA-256 09666d4d3520fa4c…

MALICIOUS

PDF

83.8 KB Created: 2021-09-20 06:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e2c972a6829f0e2cb7ac44fb19e00082 SHA-1: 31d0f7d51e23ba3f5c34a570550ec928af00d559 SHA-256: 09666d4d3520fa4cdd7d8a40e3a52197a44f21c79277a2d1e2f8223a3c57a31c
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to multiple URLs, several of which are hosted on compromised WordPress upload directories. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://domadoma.cz/userfiles/file/fazafuneb.pdf In PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137001cadb2e---47453859652.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/90522985490.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e32c767a6---14362781274.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/tekeje.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/gokel.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/walerowu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6e982fcfb---zoluwuzivefepumedopewiv.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/38483573548.pdfIn PDF document text
    • https://turbooto.vn/upload/files/3524414078.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/ditigukujunov.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///potanod.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/94748177420.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/xudiregofanorexewodudepe.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/92710128091.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/rotifig.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613daad684a42---58008122409.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/121802732613fae2fbbff2.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/97727396425.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/1742804230.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/79500800435.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/50952054298.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/84964114659.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/roribar.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/fugukivad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+get+the+rebirth+harley+quinn+skin+for+freePDF link annotation
    • 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_off0000de6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF680 18780 bytes
SHA-256: 148fca80eb87149e49f16073f0876630451965264d17ef7db66cbf9417ce7548
font_02_sfnt_off000127d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D5 11160 bytes
SHA-256: a86df5f83b9ac5d22dae73c58c5fb199caf96ef979e26bf609e932fa82803d74

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