Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c6fbbcc56200ab0…

MALICIOUS

PDF

71.7 KB Created: 2021-09-06 15:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9cb8cf1f531c79fce4654ea91cc6ce2b SHA-1: 2376b24aadaeb0da1a16216a105a8bc718819a67 SHA-256: 4c6fbbcc56200ab0e0ec49581169f464f4749350d083242a7e1bd3be2cb1f4a5
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple links pointing to compromised websites and disposable hosting, indicating an attempt to redirect users to malicious content. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/majazasatafijikatopi.pdf In PDF document text
    • http://ecohort.com/userfiles/files/pafogivibinidofazedapej.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/a002594d438c889fccda6a3bbab6f1fb/nidusafun.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/rujivopegiwupebet.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b71658a6a4---wifazafinupopima.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/75933614864.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/55866570616.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/90516604550.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/ribobuwapulasovurirazis.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/25347780347.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/memalesozamelujariwo.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c01075cebee---jedopedufepafid.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609495a9aae3a---80684978712.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/7414c553fa4682e103374460303f074f/gepijexirozuziripi.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/zefupudasizolifud.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/borububamupaluf.pdfIn PDF document text
    • http://skisun.it/userfiles/files/lixoposetigik.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1627276967.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/kezukiwonivurazek.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/73812025334.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/42164119966.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/jetezojubi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=save+plots+in+pdf+pythonPDF 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_off0000b826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB826 16304 bytes
SHA-256: c99dc125d53578e840e54d70b32709bd1c29849f8cd2bd5e3d56c2839dd365a9
font_01_sfnt_off0000e103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE103 10748 bytes
SHA-256: 2ab4565d08e2dc9a4fadf9110cb55f998db88d793dc5741f60a3936102851360
font_02_sfnt_off0000f9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1