Malicious PDF — malware analysis report

Static analysis result for SHA-256 d10c0e0ad2db420d…

MALICIOUS

PDF

72.3 KB Created: 2021-09-11 23:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6325aadccc33bc737d98804f25068f7d SHA-1: 0fe7c042722bd624c51f3be4d319f2e4b8bb0f58 SHA-256: d10c0e0ad2db420ddcc27ee9d697480bf5747593815af815931c19eeca84a3d4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The presence of numerous external URIs and link farm indicators suggests the primary purpose is to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=anime+themes+for+android PDF link annotation
    • http://leinerpakgelatine.com/survey/userfiles/files/52921389065.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/kanovuka.pdfIn PDF document text
    • http://leguido.net/files/tuxexotetudoparagaxuteno.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/20653715121.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/misimipiv.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/kovukurajixubulamituru.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/43113226665.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/3940860861.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/rodedozuwetudixitoxi.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/wisewatexomup.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210911060135.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/jikazaxugazusumito.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/79253099853.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/wadudaw.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/f4e40634ebd9a53751af8e1b796c0d39/xujugiriduberumuz.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138a2f77c238---91777086766.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133deb24900f---9775196288.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/cc71247757210594c3b56a3a1d6a2390/15156728227.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/mifab.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210901084608.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210909183316054.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/pezagoxe.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/nalarit.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/d504a6746d826f0a2c59f96d5da13ae2/fatojogininewo.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_off0000b9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9DE 16292 bytes
SHA-256: 1a85f3753f64ea735cf84fb54daa03fcc98cb6a0ee215deab327698227b9c294
font_01_sfnt_off0000e439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE439 10552 bytes
SHA-256: ff0888b59dda3bf6126e783789742d5807518210903f577750daef2963831bfa
font_02_sfnt_off0000fc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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