Malicious PDF — malware analysis report

Static analysis result for SHA-256 2950e3409fc731a7…

MALICIOUS

PDF

86.4 KB Created: 2021-07-04 20:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 027a6ecc9f21cb8c874967aaea20d2bb SHA-1: b9339c6c40f7db57c521ec96ee0111b070cab636 SHA-256: 2950e3409fc731a7a232e0c99bfad68d3e7f07d6c1c05704a89d1d5aff492ce7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607373827e432---zulajevijo.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/23249964e160a6686a0d5ec4c60311ba/86245247612.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3d350a49c---27506027009.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59cf1af5cc---5883135235.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ue5us4lnlv9e3rh8c0lj3rlkr0/10475937082.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fb3d81d96a0ce41c84645029e2f9fe0c/2302926033.pdf
    • https://tndvn.com/js/ckfinder/userfiles/files/814277779.pdf
    • http://energo-winstal.pl/userfiles/file/genesagikoge.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/32e8b49b0140be555f1185044b476351/zipogap.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe1a804544---84257979951.pdf
    • https://stef-nancy.fr/upload/document/93490594618.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/4af1ebc32507c79c01a80f14c96bc38c/73770346411.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccdc7a7ac01---95231868844.pdf
    • http://lyzebrno.cz/userfiles/file/xelojawizuva.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc592387b1---zesazubunafuw.pdf
    • http://qianlong99.org/ckfinder/userfiles/files/badejuwogo.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/3ec602d73c5af48cf88e29784f9ecf1c/27840674289.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b736af50761---nuviwawe.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/e60bb92e35a24e8b83a340b617c37ddd/godanived.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a1127bc8c---16133203298.pdf
    • http://webinaris.org/ckfinder/userfiles/publics/files/tetapunewotekoxapejujuga.pdf
    • http://altaprecision.com/userfiles/file/35232396938.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/6124118051.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=clement+stone+pdf
    • 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_off0000efea.bin
4c60f295eee837aedc9ccf36a460aa94795b89425388b474c269dbb153c2c6cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEA 17128 bytes
font_01_sfnt_off00011cf3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF3 16792 bytes
font_02_sfnt_off0001350a.bin
2bc7c039b57f13c5b954bd1d7156a081ee1253f44a46e1549e378d07f6a7db50
pdf-font-stream PDF embedded font (sfnt) at offset 0x1350A 10336 bytes