Malicious PDF — malware analysis report

Static analysis result for SHA-256 608dfec71a75ede0…

MALICIOUS

PDF

95.1 KB Created: 2021-08-22 04:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e7eb7a9bb95cab3e35210c0c9971eb9a SHA-1: 00355ddc58bcd110318679f386706ac701c92f1a SHA-256: 608dfec71a75ede06b2e1f69c51918ca8607fd4da34041fec4d42fcefa330ce3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains heuristics indicating it is a link farm and a lure for password-protected archives, suggesting it's designed to trick users into downloading a secondary malicious file. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the presence of multiple external URLs, some hosted on compromised CMS platforms, points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 7

  • 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://fotovipvercelli.it/file/zenerifezivosi.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/a32f471982c718c695d3a828628b4bae/51642213380.pdf
    • https://signika.pl/Upload/file/sasanuvukurumegipuzis.pdf
    • http://baovephuongtroi.com/vietkiendo/upload/file/95304928646.pdf
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6618585565.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/64c7b1e11c253a07ed3be9c8dc3601fa/11684706276.pdf
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/eod6n12jkggrkbarsdgdlk5ard/bawajapunowu.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/6ef6064a7c4275e9d63a974faf6e5cfb/87297183784.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/623b25a8d8938566df7b5d7e0dc60e65/toxasugisolixod.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16075f26dd5d16---tuzuliwemagewube.pdf
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/43785564018.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/15569317028.pdf
    • https://sluganarodu.org/userfiles/files/64967179783.pdf
    • http://savemaxint.com/files/file/wagodenawegidunetat.pdf
    • http://poltinik.ru/userfiles/file/98199239573.pdf
    • http://asahiru-ban.com/files/files/matafinu.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b362f64ebf3---ruvalixir.pdf
    • http://cheumst.com/upload/fckeditor/file/rexorugalasikobagidiliki.pdf
    • https://blokhol.com/upload/files/9062477529.pdf
    • http://parkhigh65.com/clients/4970/File/28385600808.pdf
    • http://sns-russia.ru/userfiles/file/womexuzawaxajo.pdf
    • http://accessiblevehicleservices.com/userfiles/file/17980184911.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/sakotutod.pdf
    • https://tepihtrava.rs//files/zewagu.pdf
    • https://vietucmould.com/img-vietuc/files/fedajagurewubadipa.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb0265fd8b---waxuxozozo.pdf
    • https://www.truemark.dev/Developers
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=java+interview+questions+and+answers+for+experienced+pdf+free+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_off00010b2b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2B 16792 bytes
font_01_sfnt_off0001233d.bin
540f67db0503d1748bf8e31ec33bb63230b74f534b37418e71880040db97ece9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1233D 18340 bytes
font_02_sfnt_off0001540f.bin
edd8da7a2cce9a01dd01c847be606856a0d939595cee83cad3b5976fae5b8557
pdf-font-stream PDF embedded font (sfnt) at offset 0x1540F 11104 bytes