Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c0da305a74edcfd…

MALICIOUS

PDF

92.7 KB Created: 2021-07-22 02:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ace51d369cb2ab79f7ae9608650422b SHA-1: 57283e6259215ca1c87148c165f01a6c3aa53e65 SHA-256: 7c0da305a74edcfdda61abfa21abe541e52b0d248ed0159827b457323bb48c02
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains links to algorithmically generated URLs hosted on compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this, indicating the file likely attempts to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://studiomedicoveterinariobellucci.eu/userfiles/files/dewodoretiragekefus.pdf
    • http://apcmagon.com/userfiles/82089786121.pdf
    • http://texmet.pl/userimages/file/72270282986.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9c8491272---firipojuxesa.pdf
    • https://sukhayurveda.in/userfiles/file/25837854760.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/09r50aoe5otnfubhjvqanqu8qo/gibunuxavitodikin.pdf
    • http://arcomproltd.com/userfiles/file/37201049290.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/50aac7f732b1778f8a7d2e98e2d2757d/41645059.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732bf1375f5---65221498266.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc080bc853---kenaborafar.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160900c3a792d9---61500876680.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/9419172d1e0b3675a21157e50cd7330b/70295771089.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/eaab0ccaade1d04228d04c9eb27eea45/25281170530.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/6b36b1f74d3163ced7fee970fda02ea3/dosofezerurejexole.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085824ae39a0---kegekupasemi.pdf
    • https://yuktogel.com/contents//files/80875461408.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/5743996dcfd7b35e1dc1f25f8c2c9bef/kuzesogilafeberipoxosegu.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c777f21dbeb---wedixakezupolev.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/7b6bh3l6khpue64gnqntk1v0n4/1014556979.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4681f33c7---lagoguw.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/ac1d1b1074c435e4d355050866fb4f13/loner.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/h4t7b8m6549jumia69u94ong4l/dijijejodafujixum.pdf
    • http://aceonlinementors.com/userfiles/file/72847917108.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/32usvdjrvsnj9e1eo980stbsh7/togovos.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=hearts+always+hunger+for+mp3+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010283.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10283 16792 bytes
font_01_sfnt_off00011a95.bin
740b470bb1363eeeea1fbb3b6750f3444fa3dbb61d5cd944576528872c58ef1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A95 17948 bytes
font_02_sfnt_off00014956.bin
62ae57a420bd20243581e81b381682b1cc53a6f1a7cfd80534e4c8e550f16340
pdf-font-stream PDF embedded font (sfnt) at offset 0x14956 11316 bytes