Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfdfe733031588cc…

MALICIOUS

PDF

74.8 KB Created: 2021-09-16 15:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0ee14608a6b665e9cc8e00f15846c107 SHA-1: 24aa20ff8cc8ad3503bddb0ae8b616116d86cd4b SHA-256: bfdfe733031588ccfcd127ff396caec6133193ed00ff6643a7e19ba1371eff60
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised or disposable hosting sites. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://vxclouds.com/userfiles/file/remusorizofekizuxomo.pdf In PDF document text
    • http://bronia.org/userfiles/file/pezinitolibegodur.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/notedu.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/noxug.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/91770351887.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/92630765535.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/522083a1526254af08d239c4de110586/91001638832.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/rafesobumonavopesakolalit.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/31015507270.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/dogujazikivazukigamule.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/kusinagu.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/24046578598.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/najoginixamefomi.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/siriwa.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/ed3a9813b351b5694f4ca94689ed218c/goxazexirazuxumefik.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/20129343669.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210902/2032496296.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141c36ac9693---mumufuzewag.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/65239154229.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/83038719547.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/neraxinuseluxodigalopon.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/72804139666.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/10698972649.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3a3777e2c---54861303459.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613968bb51634---12289151076.pdfIn PDF document text
    • https://oferta.lt/i/File/61167003462.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=mg+sreekumar+ayyappa+devotional+songs+mp3+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_off0000b993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB993 11464 bytes
SHA-256: 08c7ae2e22d520a761b2d914f460d02f2786c851e2f712a1b66b8bbc5b375ca9
font_01_sfnt_off0000d495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD495 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA7 18624 bytes
SHA-256: b638a93e7ddfb25fd0f9bb37019142acab804f8886eea0c35b53009bab520a10

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