Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f88be177af951e7…

MALICIOUS

PDF

113.8 KB Created: 2021-07-01 21:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c3cc67e3a7c1382e2b82d7e97ef0e28 SHA-1: 20c0686c1a0408c2f7256ec26b34e7cd0eb803f9 SHA-256: 5f88be177af951e717cf56ebd5ef9ff3506a3691a4d03148b78bdb03b58474c2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm hosted on multiple compromised and disposable domains, designed to lure users into downloading malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external links and the heuristic findings point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=faststone+capture+username+and+registration+code
    • http://lhjmfamily.com/clients/5/5d/5d8645f74963a96e1aea25f3b610eff6/File/pireluwa.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/c7219cv04q67i4s80b5gjoqbe6/rosiseniwi.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afc511796bf---50034391530.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607095c94a8de---12637424574.pdf
    • https://artenika.pl/fck/file/luxozixojafokituk.pdf
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/9db54a2b4a3248c5e26331bace010b8f/sobiwexolofi.pdf
    • http://doubles301.jp/files/ckeditor/files/besasunav.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5571b773496ca7aa762e75db715b1449/jopetokawukubosopomiloz.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/2d598b1682c9304bc258eebea79b6d78/54090418652.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1d5e20e95---denuz.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8f278b63c---sezanegufobotazowo.pdf
    • https://edarky.net/data/file/xawizowuw.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083a354b7824---95773032636.pdf
    • http://bygreenpure.com/userfiles/file/jiteraxawezaraguwomoko.pdf
    • https://almuhja.net/ckfinder/userfiles/files/vabow.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c03de6dd3c3---gizotinobaratikojufi.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607191995cc6d---devaw.pdf
    • http://cottoneauto.it/userfiles/files/57321898683.pdf
    • https://topclassgreenery.nl/images/file/dofivubuwexegovu.pdf
    • https://espiber.cl/images/uploadedimages/file/sebewesafunibilifid.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/8211ae74f1932fd805458f1284f78fc5/megetoxibiwilapobiwugaju.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c361882c007---63112223420.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b68271491fa---15726556989.pdf
    • http://meyergarden.com/ckfinder/userfiles/files/wadasafitenijanadup.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9be.bin
b814fed5f91b0782c7ee540334328da52d2e21582f1ff8af2b7fcf0d6657dedc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BE 16996 bytes
font_01_sfnt_off000105d1.bin
1e8d57b047fce89d139c259f8c2e89a46af0ee339592cfb5db2402d9a72b0949		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105D1 48720 bytes
font_02_sfnt_off0001860f.bin
51ac0d4834002229a3d64565ef653ae00384ca4d8b6e81f53bbb3c14036c4139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1860F 10888 bytes
font_03_sfnt_off00019f01.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19F01 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.