Malicious PDF — malware analysis report

Static analysis result for SHA-256 937139343d286ca3…

MALICIOUS

PDF

76.1 KB Created: 2021-09-21 17:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ff526c9372a3cebdb2f55ac9931f70c SHA-1: 4999dccd1896afc20ee3d657b6c69e4d4e53858a SHA-256: 937139343d286ca3a8f5e1f0700751a4dcf65bd61d1e12b2fe1abca980644315
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains multiple links to compromised WordPress upload storage and other disposable hosting sites, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lead users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://tech-in.info/bramy/userfiles/file/mowinagoxepiriduwagi.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/b27ecef526f5a7ce49a37260f96ca9ae/37541709741.pdf
    • http://dreamsurgerycn.com/ckupload/files/83883120945.pdf
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/67622351441.pdf
    • https://hotararicedo.ro/files/files/39354320167.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131651a1010e---2862666921.pdf
    • http://zabbeleecooking.com/ckfinder/userfiles/files/tezijigegorumakidul.pdf
    • http://gardena.crazyrockinsushi.com/uploads/files/85825194786.pdf
    • http://dezis.ru/uploads/files/garewepige.pdf
    • http://asupuro.com/user_data/image/file/likabimawuvefibuge.pdf
    • http://m2m2design.com/userfiles/28283409942.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c91b571cc7---33645349547.pdf
    • http://trunglamdecor.com/uploads/userfiles/file/78844849551.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/e75a3ab3fae3c8ea7e35a11d967326b2/labipibegasugozodonu.pdf
    • http://www.siscbolivia.com/admin/uploaded/fck/file/numupafoxaputaxeminevage.pdf
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/9746985145.pdf
    • http://jolanyee.com/upload/files/202109051112081702.pdf
    • https://fong-cai.com/upload/files/likutubitubalusir.pdf
    • http://taispacedesign.com/upload/files/niwanan.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16140a3a5176eb---rinejurilu.pdf
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/zuwivowevugexoki.pdf
    • http://broadgatecapital.com/userfiles/file/jijimakarodumaka.pdf
    • https://processwork.archerhuang.com/ConImg/files/60502249161.pdf
    • http://vuason.vn/upload/files/28198005228.pdf
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/zepovun.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/acd328ff9e27b4ffcf50b771a84819bf/88782799980.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=postal+2+android
    • 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_off0000c990.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC990 16792 bytes
font_01_sfnt_off0000e1a2.bin
d99ca778b1c4b5acd2c2f59aec693dab6647f595d4a1e718f90b77751e85c242
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A2 16392 bytes
font_02_sfnt_off00010ba8.bin
f52f14f97b80b54cd146cea491e20d45de14fb0615b612a81028edd5dc5f285a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA8 10228 bytes