Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda2cf19ace8abc4…

MALICIOUS

PDF

88.7 KB Created: 2021-07-04 18:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 071a6ba6e0aa3264e83f5806cd7e741d SHA-1: 68fc78310e52b2b8215b6da00c26a251baad4958 SHA-256: dda2cf19ace8abc47b8200d7b0737ecba656822421a05b55477256e9195d5079
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The 'SE_CLICKFIX' heuristic suggests the document employs social engineering tactics, instructing the user to press Win+R or paste a command into a terminal, likely to execute a second-stage payload. Numerous URLs pointing to compromised CMS uploads and disposable hosting were extracted, suggesting a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/plc9n4ud8dbi2ftrpfgbollgbh/vedaxilunaguwaluw.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49a9c1397a---titisogil.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/f552e17944937449e353bbaa534ecd48/33404627548.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b22ba12372b---duliririgojubexozimo.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/b64e093cd30cfefc824526cf6ee36e3e/87693075357.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ovk8m4rvu878nb3epam4f5cea3/9306006046.pdf
    • http://tscyw.net/userfiles/file/20210615195743_dg8rcb.pdf
    • https://daaeportrett.no/upload/file/45531399872.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/b3c7260f4a6bf00ce54f40c1e2a00454/zufigogebuverumuvep.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3539576f54---2449838519.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/on9aue6esa3tfp8u38rj8jcr66/27803807671.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/cd69da1d48166394283e6fcbb9b6d81a/21107303485.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160779d7202190---75484897551.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c06d9900---73717053094.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084678952e8c---49256300359.pdf
    • http://sahrugs.com/userfiles/file/xozavezexozo.pdf
    • https://egca.fr/userfiles/file/dimexugiguvubewitinesuj.pdf
    • https://ktmcollege.org/public_html/userfiles/file/tasetinevupagom.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/k0qhoah38attnkvhl5mggtdn01/xabugijowojulep.pdf
    • https://drsaman.com/files/kofedirosedunawal.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/88488803b98270ea69e2eb860241a097/zifelajovixekabizakafira.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609255c66a65e---76464636580.pdf
    • http://onlineticketreview.com/images/file/35450434166.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dd5dd6fbb---40827852525.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160d23fb75bac7---wanolujobelusawuwifosa.pdf
    • http://symbioticlifetech.org/attfile/fckimg/file///2021062804330_82065834.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+reduce+fat+around+chest
    • 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_off0000f5de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DE 16792 bytes
font_01_sfnt_off00010df5.bin
06fe9fe0afc2edee35def2a1c8a5efdbdfca3f8e0242f719271996dfc0599abd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF5 10612 bytes
font_02_sfnt_off0001262f.bin
98af4a1679ea21daa4238651fb3130e9451a64ecdfb98d61e125db8231e3bf51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1262F 17932 bytes

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