Malicious PDF — malware analysis report

Static analysis result for SHA-256 188db58cfe062472…

MALICIOUS

PDF

84.4 KB Created: 2021-08-15 13:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c6aba7af7c1371c003be5f8475805141 SHA-1: bc9d86d78052eb7c95fcfd93612d4e63843c6928 SHA-256: 188db58cfe0624720062169d3222d3af72742104dd50a23c6a7487ee27d5243b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely intended to lure users into phishing scams or download further malware. No scripts were extracted, but the presence of many external links suggests a primary function of redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://inwebjor.ru/uplcv?utm_term=how+do+you+unblock+restricted+calls PDF link annotation
    • https://beautydiction.com/ckfinder/userfiles/files/48778810027.pdfIn PDF document text
    • https://maplesservice.com/wp-content/plugins/super-forms/uploads/php/files/a36e62fdab0b441721a6c125de520d17/19810429840.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/787d84dd982ae38ecf5b1318ebb4afb9/pajuzaredipojaj.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sorom.pdfIn PDF document text
    • http://guitarenko.fr/img/files/33339933855.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a84791500a---23834559600.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///98706103017.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/42622526070.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/45011771912.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/sokekamodo.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0e9135c26---6633842426.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1557eebf3---jodajesifokexakuxa.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/zanemonidoxevomawetixeror.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609bad1eb6660---xexamikavojoretiz.pdfIn PDF document text
    • http://mutitar.com/user_img/files/64545300035.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/jufurosadike.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffd28c680a---fezikupatemopedowogebu.pdfIn PDF document text
    • http://amdind.com/userfiles/file/dirikonuvopegudakakave.pdfIn PDF document text
    • http://fitviewer.de/files/file/wafenuladunadiroro.pdfIn PDF document text
    • http://globalaircrafttech.com/ckupload/files/gesozelamu.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/e51691081a0ee685534c4d4e8546c3b0/pofezotemagixus.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160774bfa4b1ba---15741352153.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f30f43c0ed---kaxotodise.pdfIn PDF document text
    • 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_off0000e492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE492 17312 bytes
SHA-256: b4e2f76004ff05067c8fbc9dec91af646cf7550e0a8c65d98bd2ba7f32c257a3
font_01_sfnt_off000111f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F2 10884 bytes
SHA-256: e622ff319e8f2c166d5fe63b5bd09746222c326288f53b0e058faa98a22b3da2
font_02_sfnt_off00012b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1