Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7861a49e8745d5…

MALICIOUS

PDF

86.6 KB Created: 2021-06-26 02:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2b35b3808ea031cae62c12af47f245c SHA-1: a9202276d4cc640561ca4469e4d73fae5bb0af0d SHA-256: bc7861a49e8745d5b33d1e223ffe818ebf4cd7280462d9d230650779118f4f9c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting further supports this assessment.

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://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/ha88pps5tbvk4a061tq05tjefd/pofimi.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/606551698af5d2d5715d08eb99dcc79b/kolemiretisafog.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093bb2346c43---15812139449.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/ee9360cf74ac54f1bb3c9daedd824c09/69645629470.pdf
    • http://yaeram.com/userData/board/file/52169772616.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/dff1facf63af10ad30119fe10b6da408/48053508123.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/zewegofowibifelobefen.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608adde59c25f---42795714285.pdf
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/d0ff04f40b610312fd11a4bedfddb64e/fekiluguguzudo.pdf
    • https://vayamcs.com/content_files/files/xarug.pdf
    • https://f27szerviz.hu/upload/files/99348713846.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/d4093683e853cc3657e45b13c1bf00a7/gubegojukojufugafesagutuf.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/fd77d619bda64d91fe7a15678a0d8114/21461409130.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3c4b4600f---49548837556.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4bf035ab8---begugowapepe.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/oh227hlahpcngp6ljstnct4sfu/64717689551.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fcfc2f56e---19419384815.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7141451303---lomunafozigis.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adbc6a6efc---neweroxakanefirujaxugor.pdf
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/jilikapatexadavo.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/c06e9ca804d3da7b48435d5111344526/pavebisadikofi.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa41513751c---xuboxagadojinotagawar.pdf
    • http://ristorantebiscione.com/userfiles/files/29584976394.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18062f6a3---vutixasideluz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=2017+hsc+chemistry+answers
    • 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_off0000ea37.bin
80eeb88b7f66cdc4831bda2cf515e1bbed454361eecc329cf819bb410e706ca9
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA37 10776 bytes
font_01_sfnt_off00010315.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10315 16792 bytes
font_02_sfnt_off00011b27.bin
219c281a3e08d99235eb466405715ae0ff9dff7ae79b8b5d4db7993b1eff59a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B27 18360 bytes