Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ac1ca7ccf0e07a…

MALICIOUS

PDF

106.6 KB Created: 2021-07-08 00:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a604cb446bc78a01d14c842d270c7e7 SHA-1: fa32b66656da32fca5be155eab7166f90c74c0d9 SHA-256: e8ac1ca7ccf0e07a9b3cd8919af18bb28857a8db4683e08b26723eaf12111f40
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely serve as a lure for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/243d66bcb635ae03bd61c7083e13fbdc/mexidadoje.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bf7f6dde9---giruvabutededuxuva.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c61f689b265---78357502586.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/bc6c55144fb02a0fa710cfcb8298d6d4/vagakosilesasewapaganugi.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/7737bc50cdfad3bc2b579cfda382876f/84297181333.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160888c4b3f1f1---nakuzi.pdf
    • http://aaykpn.com/uploads/editor/files/fukiveranopemifadomover.pdf
    • http://ashioke.com/images/library/File/12997148039.pdf
    • http://bannhuaduong.net/upload/files/joxowovopaxibajuweforuraf.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/4bc9eb52bc893c7e50f47e82805a2f41/gapalufoxuguxevodefepusa.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9903cbc40---gavigidegoroj.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086686ea140e---36071235950.pdf
    • http://piri-piri.pl/ckfinder/userfiles/files/nofemorijelagunodezek.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae608b346a---24039170703.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160963ab647efc---satibi.pdf
    • http://jevades.com/aircraft/fckimages/file/zezofo.pdf
    • http://lukoilmarine.com/ckfinder/userfiles/files/ranopufetofixarok.pdf
    • http://geopraxis.it/userfiles/files/44663698380.pdf
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/97792204236.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/789632332f5a792ce4fef4bcea02c52a/janiv.pdf
    • http://global-insurance-broker.de/downloads/rozivijip.pdf
    • http://kimyasaldubeller.com/upload/ckfinder/files/tesejiwizipakojasidogox.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=ectopic+ultrasound+images
    • 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_off00013f4b.bin
b9240e0bd39a6e0cd35fe694edc8e8ee6884550b2fb1a522c35eea074dd6b7e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4B 17192 bytes
font_01_sfnt_off00016c25.bin
9156e00dc1d07f0f787bfd479b99c601f35f4fdf898fce45623d7ed7c235107c
pdf-font-stream PDF embedded font (sfnt) at offset 0x16C25 10940 bytes
font_02_sfnt_off00018543.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18543 16792 bytes