Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab1b6e0a184f081…

MALICIOUS

PDF

89.1 KB Created: 2021-06-27 10:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: aa10d3aaed455e846f1a71ca2d5d3bf5 SHA-1: 9a548f1c3be108eb88168412d24e3a72d244ac53 SHA-256: 4ab1b6e0a184f0813940e49a35c6bc5b3e260815f617433581d431e1e0f634c8
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites that host further PDF files. This suggests a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://infrive.ru/uplcv?utm_term=solution+of+a+system+of+linear+inequalities+definition PDF link annotation
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/3783v8igdjj9p3ncvlkhpqso1m/juduxufutonivazuwubavuwif.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b15bc77dbc---15154107682.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/11385669894.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050304474273499.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/3ab324aeb2f0de173bd251431bdb6b1c/51924872113.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/9f3d264d2589e08d85d5b74ef447dd4e/23883014821.pdfIn PDF document text
    • https://schmitz.cz/res/file/68199815614.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090b5856d4a5---19575409594.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a4e49c5c9---53969407830.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/936b0c6508a0a9957e9949a23c8e5050/30331040149.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/h66huuim3rhof3gg7ifkjhtq55/30488517545.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/440mc6svupo1aaq0sk192taahc/85669373371.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/mirnb6b8ftpisvmj6q08ae2hiq/lemikowerulamaji.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/mupuresusuj.pdfIn PDF document text
    • http://maidichike.com/upload/files/48911184384.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/46723168364.pdfIn PDF document text
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/fowalidazerabavevapur.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/423056187b7637ee3927ddf227602aa0/zokajaxediwu.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/18435733518.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c752659d0---kobititaduti.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a99f8648534---9343200350.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/demufojejivajulabinani.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767f220d250---dimejeruxugusilajatipijuv.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/koleduzoxizajobikifot.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE184 17472 bytes
SHA-256: 5c062161b4e99b6e6b796251b6c5e7458c9d2053907a0386ef4fc848b18eeb92
font_01_sfnt_off00010f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F86 10952 bytes
SHA-256: 84eb855dc9991859d3ed0cff165d55cc31fab41d27f824eb0710fd2fa0429a0d
font_02_sfnt_off000128b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000140c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C4 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b

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