Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d7c332c6b19e0c…

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 04:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a0614147f5d9d4e79023a174b4028ec4 SHA-1: 71f77c19f3e8a04cfe44013c173250a7f586dd88 SHA-256: 84d7c332c6b19e0c55173bc2beba5faa8b2d216246b5736007fe9720a3cfcce6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely 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 0.9949

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://shieldtech.cz/ckfinder/userfiles/files/xusofivomipeziko.pdf In PDF document text
    • http://airzo.net/userData/board/file/17124981354.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/porazatumi.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137c646e3e31---60964714198.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/zuwovasusagifileganawiko.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161437eec1ad70---riparovam.pdfIn PDF document text
    • http://steinemann-ag.ru/viwawarozubokex.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/46700484772.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/lukonosero.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/fipugawoxupuza.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/pekifupijenesuratapu.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/rodowewulavixurasorivu.pdfIn PDF document text
    • https://lorus.rs/files/89137402264.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/2b0069aae6498033625e2b2d3ba8f11d/bisujoworegexoxowime.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/bcefa29d869c66aa4eaf0bc3f6400b94/wedokipivuwimebuvakozijav.pdfIn PDF document text
    • http://bienbao.org/uploads/files/safokabadasobutegiwomev.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/37691222493.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210902_EB9F457BA81FC182.pdfIn PDF document text
    • https://rintrans.com/files/wirobewodizefuxibuvarebiz.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/vipetesazo.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/gafuxa.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/65061437671.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/zawegijojavamurino.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/m8q5ps6kshqtvogq5scme47ii6/lugenu.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-12/20210912202818394520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=forgot+my+pin+code+to+unlock+phonePDF 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_off0000d444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD444 10912 bytes
SHA-256: ce8078c48fc6ec5bb8fdb1a4366b73606ea51cf8240702ca9531b4561cfd8913
font_01_sfnt_off0000ed1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001052f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052F 17756 bytes
SHA-256: 4f5ca6460c41eb851343901925ea67d55a0ce2e05f51cb6dd5ac1a778f76d2b8

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