Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c2ea6abf9e9841…

MALICIOUS

PDF

94.2 KB Created: 2021-07-20 00:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 046b8a098546a940cb9334ee01d8daeb SHA-1: 71652df96765d54497fee0d6be31c746c3c6dd4e SHA-256: d5c2ea6abf9e9841570118f31460ee89f6bc019cbf332b50e74112098f45286d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the embedded URLs and the nature of the heuristic firings point towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://zlatartopalovic.rs//files/77837409569.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/c19bf718308278a607a588a823eb8925/tukipulijigofus.pdf
    • https://tonitomov.com/picture/file/rulovuperigo.pdf
    • https://nestuby.com/userfiles/file/tupojobijekifiruzes.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b93bc60d6---degarimafijufapuk.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/nrd53tun9uqs7ecoqmgmmlf92i/2566589396.pdf
    • http://webinaris.blog/ckfinder/userfiles/publics/files/35586082016.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a996b764822---taguzufejebonimew.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/c036e34cf0e4508196bcf26d978cfdfa/natowamegu.pdf
    • http://www.siposferenc.hu/html/rixuw.pdf
    • https://psychologgia.pl/Upload/file/69872374566.pdf
    • http://nitexprofi.cz/userfiles/file/dudelivixibazi.pdf
    • https://nabsangram.com/userfiles/file/tekusefiloruv.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16081148fa31e9---nexugozidazuwekufozudo.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806a1e69b9b---4158816209.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a113edad785---lonowubitafiso.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cef01b951---3895995296.pdf
    • http://heyumpnd.com/userfiles/file///77903999844.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/c3nkjshbqajbaameb14oplff9c/47567025534.pdf
    • http://galettedesrois.hu/userfiles/file/mujem.pdf
    • http://hotelbellevuepalermo.com/userfiles/files/98107986360.pdf
    • https://contabil-fiscal.ro/mm/file/meguzofuliwuxiro.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=holiday+activities+near+me+2020
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a36.bin
e09bc96d7de23806b1de4e23482fc2003358500fad72f623183b6ee1befb9ba0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A36 10944 bytes
font_01_sfnt_off00012396.bin
a1ed20fa28ba8685e75af44142a589479c8d0368c3221ec42f689271b318a7ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x12396 17884 bytes
font_02_sfnt_off000151d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x151D1 16792 bytes