Malicious PDF — malware analysis report

Static analysis result for SHA-256 abd62d358206249e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-05 17:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c2dfcdeeb53d8182de0a040ecd4d37f7 SHA-1: 9f28d2377f14ce4b00bc05108736d7a70713f220 SHA-256: abd62d358206249e5558ab9f61d18f730852e1263968e3c5aee93f0577e2b4af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the link farm structure is a common tactic for such attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/zebavivizebivivixubajaxa.pdf In PDF document text
    • http://bafiti.com/sklep/userfiles/file/bijejanazenerusesas.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/vizidurixakenuk.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d5aa7b22cea---gonutilofisaxi.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rixuxa.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/76996918438.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/3d36cb186afe2911af07c03ca109d6ae/tutenadewoputaloradop.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/96163561843.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/62094102675.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63a35ec304---tigomuromoxaxis.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/90756258948.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/40b12091aab69c0f0d8b8a91da50de64/watifu.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021819132666704.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18e702e6e4---62812031652.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/41gai1ja3qdpthmokmdra2k6jp/kuzifez.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/304a32644322fd63b7367a4eafd0f347/2053118775.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a93942e012---nobajukawowerigemanusizu.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/89260647024.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/0739f9fd87b582e0e47f6a4f3683cebc/xenanuxufuviwon.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe8838ec9f5---90074405267.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/vewal.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///pisilanujife.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/8765956825.pdfIn PDF document text
    • http://gysanya.com/upload/file/210823184643911722tsvkncpssw7i.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=download+ebook+negeri+para+bedebah+pdfPDF 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_off0000d50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50C 10832 bytes
SHA-256: 1fe09b713be4482be9867eeb838f269706f706acd65c39c882d563bce144c6a9
font_01_sfnt_off0000ed7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7E 19012 bytes
SHA-256: 1d4fd4a05bce18653f71113a8791f7c3f4a9ac862f872533b135c2d115460749
font_02_sfnt_off00011f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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