Malicious PDF — malware analysis report

Static analysis result for SHA-256 479da7cdf14b664d…

MALICIOUS

PDF

87.6 KB Created: 2021-08-02 22:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d8d19847c63870db01d30bd5ca181e73 SHA-1: f90f25e4f8d36c1b004e1d6f434d0e89fe27d730 SHA-256: 479da7cdf14b664d3b76119f37c657d4efa94ff53237aef567318a42a9d2f6be
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://prairieroseclothiers.com/FCKeditor/file/sexal.pdf In PDF document text
    • http://delve-cr.com/uploads/tidid.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7b9b39708---nojiwolodaduwovikokap.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/90862583442.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/mibez.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/885df638529835d0ddcbb9bf9dd09f0a/zewogixaj.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cab463d546---30065951964.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/rosuvegabaxewesuzulu.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9eed1def1---31782159696.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/97405579678.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160942d1e7d293---dodemaxixiregidoda.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba88ad28d2e---64602467371.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16091f092cbe68---27020002955.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/18eac368571f5d170f0c37826fe5f218/mitilejafagajovas.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/5815a69ecf33953ca70603f2e81e91e4/pinidokurozitinusolapukuf.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/0f0f44ada91490643c494ad66fb486ff/66657730437.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/39d7ntqodoro1a5ffb192kc910/fimitubebenozi.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8366a5c95f---4473791395.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c87e6ba8e8---zaxutapelaxowoku.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/d6abc1c5589a77a8a5a848a9fddbaa40/25124745753.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/cdc6b06d10af81c80a1e3fac487a53e2/xiralasadiwuw.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/29830154237.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/3ac61bdcc84314858758dea2572a6c9e/35012697102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=present+perfect+tense+verbs+worksheets+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 10804 bytes
SHA-256: 6b65be1459323a04564e754fd7f4209b031570f5fe6bd45029f7965b89ef4cfe
font_01_sfnt_off00010a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2E 16924 bytes
SHA-256: 03f5c6a50a16a0df6e7337fad56770235187fdb954e42a2205e014c0671af5da
font_02_sfnt_off00013635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13635 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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