Malicious PDF — malware analysis report

Static analysis result for SHA-256 0654481e568bf539…

MALICIOUS

PDF

83.2 KB Created: 2021-09-19 22:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7c38efdffd724492aab5100989fd3018 SHA-1: 692a8c16e3c5f6700ba5d6681e2624b82c0dccdf SHA-256: 0654481e568bf53945e824d9934b2998eecfb2295a667f54a3c5522706b9b5ec
216 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs users to open a password-protected archive, a common tactic to bypass security filters. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://medvor.ru/uplcv?utm_term=how+to+reset+android+lock+screen+password+and+pin PDF link annotation
    • http://keitbg.com/images/files/bukulumodavoxebe.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/dipemo.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/14140424274.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/kirifubu.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/19655931298.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/d38879ea393d3cef8b2c9e05d5d857dc/936796488.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/5776135553.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/74057089405.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/31037555085.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/mujavevitibikedorediju.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/31581867194.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/19262665891.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/gekuwe.pdfIn PDF document text
    • http://turnyras.lt/Files/file/46695752610.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/70213328485.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///legititupexexebisuwevemik.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/dezewidedakom.pdfIn PDF document text
    • https://invision.buzyhub.com/files/jitefisewamavifunevano.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/14805065346.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/34414939753.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16132c32637a79---61583095813.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/462731952.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/nubifaze.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614445910a3ea---tosaxul.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_off0000e0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B4 17488 bytes
SHA-256: d4e08edf166d795e6b3421af342ae48b64db4ff5942c0e605b4424ea4b9bca45
font_01_sfnt_off00010dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD8 10676 bytes
SHA-256: 4bf68c163a79844a743fb8f3525d71a78afc369bf1ca979eb15057e7a8158054
font_02_sfnt_off00012676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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