Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0931410c303fb6a…

MALICIOUS

PDF

71.9 KB Created: 2021-09-13 01:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a7f11fd960331863644cddc7454bc5d8 SHA-1: cf3d46f3539c0b29552e339e76294f9c56bc180c SHA-256: d0931410c303fb6afccd1e0c812c1690cd7a5f137b8ed4e3bd5316318f4679f2
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs hosted on various domains, many of which point to compromised CMS upload storage or disposable hosting. The primary purpose appears to be directing users to these external sites, likely for further malicious activity such as credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://digireg.nu/upload/57651488030.pdf In PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-7/20210907002416825275.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/taxizojukamenoxebe.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/jce697skfuctt4vkgs2vma06k4/vasegedega.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/zorusanajuranuwofineg.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362c2ff25d8---15721064572.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/rerujuwaxutuvitebejilu.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/9d9q0jnhm0ih5jdq4d7mb5q3tj/70057435094.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/tesujukezilud.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/56942492343.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/negogonotafevitagujow.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319d507ab51---93539725472.pdfIn PDF document text
    • http://freetds.net/userfiles/file/25225167173.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/rerobo.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/25360503932.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/74234608751.pdfIn PDF document text
    • http://wwstationery.com/files/file/xibama.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/44251325516.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138e9f872edc---93113850957.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/29460256612.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/wivifugukaxagumik.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/nokaruruvukexed.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/zatiguvarolisawibide.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/30120308714.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/rijixeduwelof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=punya+dinamalle+mp3+song+downloadPDF 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_off0000b7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7AE 15844 bytes
SHA-256: 188805624234e59bc94fa9fb7415b3cad436213adaee73a688e43ade15cfc88e
font_01_sfnt_off0000e011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE011 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF828 11012 bytes
SHA-256: 326e2f7bc88cd4993cbf444ff2d0737f62aed30762cc7ea6b0385f21a7b5f9a5