Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1845d2629be4ecb…

MALICIOUS

PDF

83.4 KB Created: 2021-09-06 09:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ee72627ffdcfa2f9f99cf0fdf600cdb4 SHA-1: 56874582a3cd22675a7207f0292ac132ab748904 SHA-256: d1845d2629be4ecb5e9e2290328ac88e7d7937e69e15864d34d4ed0cf7325240
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to lure victims to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seventyfirstclassof69.com/clients/60772/File/74810733648.pdf In PDF document text
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/nefiv.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/menen.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/dde01da0f3124707d0d2d45b99babeeb/52634611311.pdfIn PDF document text
    • https://razredna-nastava.net/files/nijumowupekiwataraxufi.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a1795f5ab---vatizokapuxomomar.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3ac7ab130---laturenitopirin.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/37777829480.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/046440b09ca0e040884380c366b61428/98598106782.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/72552354857.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7290737278---9834872260.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/9b084ac81c2a96012082a80973bd1fec/retukameneveje.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/69427503177.pdfIn PDF document text
    • http://bjjiffy.com/upload/deratij.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/d4093683e853cc3657e45b13c1bf00a7/gubegojukojufugafesagutuf.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609098eeb929c---masobazepatasovabib.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/7facf05c41d2045bf7dd2d95bb60eea3/jokaseritazidib.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/67581136356.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/31142056239.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/feaf5bcc04700595fbbbcc5045c53309/62695753995.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/zigitekutelirenifixapiku.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/deb6945a4cab5f977ffe0620882d12be/jobepaguxisiratenoluwiga.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210620070837.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e81469e9722---jififa.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/78059377217.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bccc42303d9---wogowimezowatat.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/oj7j3182d4ln5revnve622fd8n/27057995913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=nigerian+code+of+corporate+governance+2019+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_off0000e136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE136 11088 bytes
SHA-256: 72b9aea09ad1f182f3e8bd2d067cb23ca078e12e571a10119a41934f2a6a6d37
font_01_sfnt_off0000fb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11321 17420 bytes
SHA-256: 593bd25c517d89bd45d8282ef56b0af19424effd91cdb0f417f98c10ad93785b