Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6dae12683fb0a7a…

MALICIOUS

PDF

76.3 KB Created: 2021-09-23 23:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 73211e8c6453dbc6a0d5bf6183eac06f SHA-1: 5ad8e7438e37ee7eef7ab9904a221efcce82b30d SHA-256: a6dae12683fb0a7aca6582fc9d266422c77e568bb8d97c242a8b3dda3898109e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm strategy. The primary purpose seems to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://allytemp.ru/uplcv?utm_term=watch+the+100+season+7+online PDF link annotation
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148b08bda6e2---13994062346.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/vntsd6l6152a3qdnhgsrja4hf3/sagalotebumot.pdfIn PDF document text
    • http://lecostationery.com/files/file/71774429216.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a02d1eeea---taguputugowadevabujega.pdfIn PDF document text
    • https://xlquality.com/userfiles/file/93373170398.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a94f81351e---papetem.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/bamuzagosuza.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/69477156996.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/299752903.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/sagubowibin.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/migixipizawunotu.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-13/20210913193102147697.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/buret.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210913_B5D746D49DEEBCDA.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/goloxejilidadinipe.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/wakowelolunerefijun.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/guwofirifawim.pdfIn PDF document text
    • http://falconltd.pl/cache/file/gugetirajumewegejini.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/98815673676.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/mozisusewiwoj.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/lenab.pdfIn PDF document text
    • https://isleo.com/i_photos/file/23723019751.pdfIn PDF document text
    • http://border-collie.ru/sites/default/files/file/wozakeporovosikam.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/sudupavegit.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/madosozidu.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_off0000c771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC771 17152 bytes
SHA-256: 8d58ff09e7c2214397dbb966b1eae3b8c6d12e4e7c37f4bf9a1a630f23ceb426
font_01_sfnt_off0000f3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3ED 10444 bytes
SHA-256: 4756144d2d96d6cb4339e5301dc0e02ff817ba185645c9fafeb089cf135b0701
font_02_sfnt_off00010bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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