Malicious PDF — malware analysis report

Static analysis result for SHA-256 70d3e351e3987469…

MALICIOUS

PDF

85.9 KB Created: 2021-06-27 06:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae110fd22f2f0aa10c9ba9e1c17cf452 SHA-1: 52054f0fe68353df50952e5afbfb45afbfcbf58f SHA-256: 70d3e351e39874695f09c21a7a64775e42c58ab19e84add1454e2b705c78de40
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of link farms on disposable hosting, indicating a phishing or distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and URL patterns are consistent with a campaign to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://solidpractise.com/files/userfiles/file/wolexafese.pdf
    • http://investin-khj.ir/ckfinder/userfiles/files/jewibenatiti.pdf
    • http://axwelindia.com/uploads/47140058478.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607925a2aaa95---suvaxip.pdf
    • http://campbellelectronics.com/uploads/4773406672.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f20a1bfb2---zusamadur.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/tuvenizuruno.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0f51c01ec---62773624319.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60a5a069d7---44818728407.pdf
    • http://kodemari.info/data/files/ruziletur.pdf
    • http://sacmacbook.net/userfiles/file/rinikunutelapi.pdf
    • https://rumputhijau.com/contents//files/20908144532.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/906fac4bd212995f08a4e298d9646205/nimakolovagafozufesi.pdf
    • http://poorclarescork.ie/images/47872256313.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/ce55c8dfde28d65cfd07a84b5345932e/negavivufovewunureto.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/iij1e47clpklht2vil283h2vu4/xegutenagutore.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/f87eeed56ec08e5a0372136b3bda7a6f/35757037151.pdf
    • https://groupunsur1.com/contents//files/93731276569.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c4ef3fa36---58572190707.pdf
    • https://accuratesearch.com/userfiles/file/36694537673.pdf
    • https://jordanadams.com/ckfinder/userfiles/files/98997842241.pdf
    • http://scpt.it/userfiles/files/21218971483.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/onvoetkrm22u63m0f6kpdr3970/zuwuwupepifewagagasulime.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bujqd3ugn3bfridp0j6eg76e91/19282030105.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+sequence+of+amino+acids
    • 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_off0000ecef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECEF 16792 bytes
font_01_sfnt_off00010501.bin
3ec75da6006bb39b9a5eb1e81d82f815de2e766334e138a843572d24220e60b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10501 16828 bytes
font_02_sfnt_off000130af.bin
e82d83ff43c0aa3412705c2ac03b5127fa062149dcfe067fc666ad8a31ae9b85
pdf-font-stream PDF embedded font (sfnt) at offset 0x130AF 10708 bytes