Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3d5fbf79ce4b37…

MALICIOUS

PDF

95.3 KB Created: 2021-06-28 03:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ecaf8024772e7ffe8d63390556d9915 SHA-1: 84ccca49b600cc5d8e2628c82b9586d9746017aa SHA-256: 1c3d5fbf79ce4b379b2e20e2efdf8c19d0ecc53d39fffcf956b1593afcdfa56e
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, a common tactic for phishing or distributing further malware. Heuristics indicate a high likelihood of malicious intent, with ClamAV specifically identifying it as a 'Pdf.Phishing.Trojan'. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but the structure itself suggests a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://boothbayharborshipyard.com/userfiles/file/56741277404.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1b6b9e033---funufobawutaxodufelis.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed2f85aeef---zulenazov.pdf
    • http://radio6deenero.com/uploaded/files/zuvekotuwefuvujapemur.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160889859e86e3---99846446345.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/n1n79k7dq9tc40j2inn4ntjotq/jebenojugaw.pdf
    • http://fixafilm.se/userfiles/file/vinorerifag.pdf
    • http://logiccpacma.com/ckfinder/userfiles/files/wedofo.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/nniriombifncjbtrplqrsqnu93/dasekafatasijuxokumav.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/e03bda32f77debe250f5859165aea892/fokerage.pdf
    • http://palakkadtourism.in/ckfinder/userfiles/files/23003285281.pdf
    • http://bukhatirhomes.com/userfiles/file/62989502999.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/do6inc4ji0iktps48vdpn07sm5/53638211871.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/o3u94e0ho7t51kas6ls7gb8iqm/15029940246.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/e977f9bf9790accecd16c4d2614b9139/sogivebinimivuvusomoxan.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c0057a4e701---redixa.pdf
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/8028251220.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc0eb23ffe---86985507418.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/adb3bfa5d21104a7151098d966285c11/joduradenovek.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/h4cj9d3m88vgftci5il6njuqq1/33320914671.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rma20ajsinte0uthhfagedn6g2/regojizudoxinalak.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5b62c58f2---35894569839.pdf
    • https://afayl.com/userfiles/file/kijanilunidubimuteze.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9f4c80f98---31143515379.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072f2929ad4e---xejavafagifoxatogilitodas.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16096f449b9b6a---18097959076.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=example+of+linear+motion+in+physics
    • 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_off00010bbc.bin
514822134cbc031b643538244c3c2b2cb57ef0512bb0e3b54c4da7cfdced7e7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBC 10944 bytes
font_01_sfnt_off000124ed.bin
09d8483f22570340933acc313500a9e44eeed457396f15d0f8af740907812dba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124ED 18748 bytes
font_02_sfnt_off0001579c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1579C 16792 bytes

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