Malicious PDF — malware analysis report

Static analysis result for SHA-256 e174604bdeecefc9…

MALICIOUS

PDF

87.3 KB Created: 2021-09-20 05:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 69be54448926a180f5751f96f85aea43 SHA-1: c210473898c3e19ce5ff7091118bfeb88b197330 SHA-256: e174604bdeecefc9febbc72a91973d281b09a600eee49da4fde85b359a9547ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL analysis and heuristic firings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://a-pro-peau.fr/userfiles/file/lerirur.pdf In PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/nuvofupanalefofigixuwonel.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/xivediniviniwos.pdfIn PDF document text
    • http://allasclub.com/campannas/file/66614009728.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/gasisilosafemojokos.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/42539056067.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/31591140870.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/13583196603.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/mirepenusoburovugatoka.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/tufutipetinoz.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/33348261387.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392a8337373---vitokexalujiberamazajux.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/pll8qmad08u4d8o4cdt6cdr1d5/78906364597.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/xoditaj.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/47498593064.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146886d5e9d3---13949513751.pdfIn PDF document text
    • http://sbcnepal.com/images/file/83833996853.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/98428839461.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/783h8guvd14tlqr9d3rioplha2/liluwofuwefodu.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/41738851616.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/33043113009.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/28897910332.pdfIn PDF document text
    • https://magatek.com/documents/file/sugazenemategalobed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=minecraft+pocket+edition+mod+free+downloadPDF 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_off0000f108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF108 17508 bytes
SHA-256: 9d52e285e40e314d706510755524904c69642015d3ee8265dd627071b9d71d04
font_01_sfnt_off00011e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3B 10784 bytes
SHA-256: 682adc7766c8265763296a81de014a2d1a422dea13085a4612a04f953c27ca6a
font_02_sfnt_off0001371e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1371E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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