Malicious PDF — malware analysis report

Static analysis result for SHA-256 f01036b5e4b67fb9…

MALICIOUS

PDF

81.9 KB Created: 2021-09-08 00:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b75f14a0ae2b3090a9025c1e3752e82d SHA-1: 1ed5df1eded59693b30a426662a731f540ef4369 SHA-256: f01036b5e4b67fb9592c771edcf12121aed33d4d4ece183cd348e0ae75d939eb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous URLs pointing to compromised websites, suggesting it's part of a phishing or malware distribution scheme. The URLs are likely used to host or redirect to malicious payloads, attempting to exploit users by masquerading as legitimate documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=curriculum+vitae+en+anglais+pdf PDF link annotation
    • http://uhy-th.com/image/upload/files/9241696354.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/bbc573410fd288fea14d5848cc6a21d3/kobezomiramuxuxixi.pdfIn PDF document text
    • http://myqself.com/upload/files/bumilorozovaxu.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/2mk8o1o5dsa97m3mgoo65jmenn/25508415000.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/xowitegekawukanuwipomej.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/a98a2b6de1156850a87aa77768a9ce6a/razixu.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/duvuje.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/17031042254.pdfIn PDF document text
    • http://nessium.net/userfiles/file/4909871915.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/40757460260.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/35025891140.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05d0089a78---puwukovijimukun.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c51912e13f2---fofuzorojerinemerubulek.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/84846455558.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/mitozabewonulepekugozoxa.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/7b6337b66e64f11a19c04ff2e965d6dd/42411108130.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a0e43e50d---35990502844.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/u7gevkseakb4054aldignalrc6/buwaxovej.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/84237774370.pdfIn PDF document text
    • https://scriptdd.com/_file/file/62458217004.pdfIn PDF document text
    • http://recrute.fr/files/files/88002024930.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-8-25/20210825180929427220.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/kevatasorodenovure.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/65754799110.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_off0000d88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88F 11040 bytes
SHA-256: 0c3f592a4451286ffc8a017d98a813ebb5e24a52d58d59eb3288cd6414a08642
font_01_sfnt_off0000f213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF213 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A25 18452 bytes
SHA-256: b83946dd184d15933f516fb3b6815021c625046725a60a43a01dcd05874b1c53

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