Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be211b434dac8cd…

MALICIOUS

PDF

95.7 KB Created: 2021-06-27 13:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 51eb8842cf3fa769f523ae265438c987 SHA-1: 7ae1c3e8998c1785ae57e36fa677b86e21e28b5a SHA-256: 1be211b434dac8cd35c874a6bf5e5cdd5196d9419cea860d55fe4310239c08a4
126 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these compromised sites. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 5

  • 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.
  • 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://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086acffabc3e---kidurukixinusamigani.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a3507f037---gidonato.pdf
    • http://matstravel.ru/userfiles/file/7142604425.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/4utr75475np4i6lsfn7co8coh5/83560345263.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f154e0f761---gozejorujaxovudet.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/3440c96db83557c31d432368d24f15b8/kilotugosokupepaf.pdf
    • http://notarbrazda.cz/userfiles/file/nugabolin.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/c8240704efc2e0bdc31b14ca50029c29/68652387953.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f539b03cf0---nulogozazebulonor.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aceafd25366---22250006113.pdf
    • https://cvsc.co/userfiles/file/luvosowodanokan.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/0a3e62f3dcf0139f963fafaed207b132/zudule.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1bbe9ff38---39555679631.pdf
    • https://vibangthuaphatlai.net/uploads/files/87631394519.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9853c271c---49824968332.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13d3c20fa2---dusexasasis.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/79210d0667982ae157553c1a2544fe64/potelidutuzadono.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/cf524a176f6f602e81e6026368c350c2/71110293616.pdf
    • http://cjatkinson.com/userimages/69363960344.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c2c2075ca---gegudezafopo.pdf
    • https://capitalsyndic.com/userfiles/file/mozezutiso.pdf
    • http://orderkai.com/uploads/files/putavipupejibafoximava.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/2ac2d35068ddce9f2db3aee771302c3c/16830748100.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/759bc26de657adc8af99a87838dd176e/sexugipalidenujakevufami.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=top+10+biggest+airport+in+the+world
    • 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_off00010e49.bin
1b796a2de24d59934471aaa44d439a0c25dbaf44950b13ac9d5bc2af6a57098a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E49 19044 bytes
font_01_sfnt_off00014038.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14038 16792 bytes
font_02_sfnt_off0001584f.bin
67ee6753cabbcd719ef7bfe721c4771631a3eeb775ed2e211d5a0237818cf3fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x1584F 11036 bytes