Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b2880860f3a91c…

MALICIOUS

PDF

79.7 KB Created: 2021-09-24 02:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f71bbb7f894a9594c36b2473c6245b6b SHA-1: 005500a6aa9125b6eb28b206a989bdba5b324f3d SHA-256: 13b2880860f3a91c0e1b9eb40e197ff7d54b40f76657f082abfc365c85857f57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://technology-mp.it/userfiles/files/3941775992.pdf In PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/lusatuzoxogajobizolid.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/da9f9f1fd098651365138c0b8b0ef518/figodepojowavomisolis.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/bb5f270741b4d8c1e5bcf1414b208819/lorobejud.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/sivapi.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/lusunager.pdfIn PDF document text
    • https://ayurmitra.com/files/file/33087335049.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///34802834453.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/fugigulawamif.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/sasosasewozuw.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/4c3ce06153c1b781b59b8ff59cbeebb1/xowidixemujigunase.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/35945687466.pdfIn PDF document text
    • http://wirheiraten.de/images/file/dezonosajinugubexiduma.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/66650649465.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/kabobirepiwupexexugevovok.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/naziladibajawumifasat.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/73098839596.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/46993229368.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/75944688313.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/24698920792.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/reberifigibilirej.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/bedefasokuturigiwetaxebew.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/bokugebasu.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/42176350364.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/gezovixipigiw.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/kuwedebunuwiniwubeta.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/70410554241.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=super+commando+dhruv+all+comics+pdf+free+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_off0000cb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8C 11116 bytes
SHA-256: 30edb2caad968a95db366044f17cb44e03127b51f41d79329d75c7615c582116
font_01_sfnt_off0000e53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53C 19024 bytes
SHA-256: 373722f98970794ee7375fbbe46881934801c51208d29d0a377813af63bc3d97
font_02_sfnt_off000116d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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