Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa5122d8ac93e188…

MALICIOUS

PDF

83.9 KB Created: 2021-09-07 18:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c366c5420bb79c348fd5673c7ea18776 SHA-1: 497db302d1a06bc911bc116ed35fa7ba0250976d SHA-256: aa5122d8ac93e1884e33de0a367da5f75d0ee078b68674a125a794e563eaaa2a
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs hosted on potentially compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of external URI heuristics further supports the malicious intent of linking out to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://raffaelecavazzoni.com/userfiles/files/10700123670.pdf In PDF document text
    • http://greensketch.in/userfiles/file/jowig.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/2da004d49fd3b5463daa3ef3366c320a/63163439383.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/50374322828.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/garemaxanofokarut.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e13eee3517f---voxedonotuxapolilibeladaf.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/24069706965.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/26699275270.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/bexasubadukesunabage.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609474c9527e0---96725712369.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/ledevodekigi.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/98227862806.pdfIn PDF document text
    • http://envigest.cz/upload/file/99000896483.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ljq6c32hj94bki9gu6k1vu8r30/90018005636.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/vhcqcl9e9u7jbq53i84j3276v0/28177467587.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/95285238699.pdfIn PDF document text
    • https://anakaygame.com/calisma2/files/uploads/70103884813.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/d5e4b9a681211898be0893e1ee8291d0/64960819414.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ec39580f---38953525660.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/ab83bd295e55a2ef0d92e079a6c2adfe/56822890349.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/gesadexezupu.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84a6938517---10708938077.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/zexesekegaduvu.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/bekedabexuvuxawisu.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/64253986359.pdfIn PDF document text
    • http://chinazzjx.com/d/files/69220928034.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=sign+language+chart+basic+words+pdfPDF 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_off0000e266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE266 11300 bytes
SHA-256: 19e6adb1e01e6014a266ec03c245e69eaa81f3cdc20d8eaaeeffc98aae3de3fb
font_01_sfnt_off0000fc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001149c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149C 17612 bytes
SHA-256: 556ce692762ca72680e9a4c078720464e913bb15f6668f83593df293b26fe67e