Malicious PDF — malware analysis report

Static analysis result for SHA-256 161f7a8ec0a732a5…

MALICIOUS

PDF

87.7 KB Created: 2021-08-04 13:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cd6c5a47b0d501680d9c0fdf0d0db0a4 SHA-1: 69bd76b4cc97c704b098ba67cc45ff235dd074c2 SHA-256: 161f7a8ec0a732a57ba748180a0d0484666504caeae9c6e380a17095897667cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting the document is part of a larger scheme to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://irlanc.ru/uplcv?utm_term=how+to+reset+kenmore+self+cleaning+oven PDF link annotation
    • https://ntpuvoice.com/ckfinder/userfiles/files/falixedetasewegadoxe.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/23125009800.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/thh77tdnj69quvqkb2reksgjdg/wabozemajanofonexetakama.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/nuxiwetemovez.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef4d377edc---41807663088.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/nagogulu.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/23024902144.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/49465726678.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/9337838139.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/gd9764jj6ti593lej5b165cp53/93446519911.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/jilipiberal.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/xasokawidat.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/tipufunofibovetivijimuzaz.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/44f21dc41d3f6244c0788c04a91333d8/9383856681.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/9obas3i7b39868ej7ffklhbii1/36491663686.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d44c503fef4---77813599333.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c726ea136a6---59021291077.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bcdfe2575---kupanopideweg.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04b5f391f7---wokalexegaguzoboni.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210626165554_wid5zg.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/85066021001.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102b79d9c23d---37279348110.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4372d10ad4---fivereve.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_off0000efa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BE 10912 bytes
SHA-256: 660abe35d586c1213a69622733abf735c39a046f6ae99fc71c15c988b1ad130d
font_02_sfnt_off0001210e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210E 17988 bytes
SHA-256: 72942366dd9aa4ba7f198ee3aa2e6affd22862dcb57744043932c7a3747838c7

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