Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef558f296977beff…

MALICIOUS

PDF

88.4 KB Created: 2021-09-12 10:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 70f0d1a35dadfdcf57ab05e6ce08dd44 SHA-1: e88ed347bfc7ad461f851a46b2b11716dc041d13 SHA-256: ef558f296977beffcf5c8f0cdec99572fee8647276a77cbc774ea49dca17ab66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised content management systems. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://synerhu.ru/uplcv?utm_term=watch+online+taal+full+movie PDF link annotation
    • https://dagvandearchitectuur.be/_files/file/vomelovat.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/wogomewuwadexugowulutut.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/80884062211.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/26564229985.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/vubav.pdfIn PDF document text
    • http://charivne.info/images/file/56396474816.pdfIn PDF document text
    • https://pecsikult.hu/files/file/tosugeluwexode.pdfIn PDF document text
    • https://seerupit.dk/assens/file/kizadomuwukipelo.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613581b4f0972---femitiv.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/pamosutixunitix.pdfIn PDF document text
    • http://fitviewer.de/files/file/8313884513.pdfIn PDF document text
    • https://equinox-e.com/upload/files/76234215194.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/nidexof.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/458984c86226aa309af48d5f62b71375/63328674476.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/73022790452.pdfIn PDF document text
    • http://biomehl.com/images/content/files/tesiwefikiwuvutekasasome.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/3i5t86vth8098n3c2odn7g697g/pobukufobasijomudefulan.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16139deaa8848a---43184178168.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/rusuvaxipaxetosevizev.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/bakofixogowiwe.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/mosenafokufakagax.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/39903407088.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/raxorigojoletotobefiju.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/bufota.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_off0000f70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70F 10492 bytes
SHA-256: 5753b80a6a9c05ddf40e9c82d7b66c295c74ab44f9e47732b7056824efcd39b8
font_01_sfnt_off00010ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBB 17596 bytes
SHA-256: 093deef83c36072bff57f9a4e0a75611b641f5ab6e7da075ee422d7679953649
font_02_sfnt_off00013bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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