Malicious PDF — malware analysis report

Static analysis result for SHA-256 09e18f838dd4b4ee…

MALICIOUS

PDF

90.8 KB Created: 2021-08-07 02:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cccf13dc1f068fc7b47c906b573e8939 SHA-1: d33071bdac86b4d775594d36fdbc798db0d3b381 SHA-256: 09e18f838dd4b4eec73f802ac24d03dc5626343d966ab4a2874da936d61e001e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, pointing to compromised CMS uploads and disposable hosting, likely to phish for information or deliver further malware. No scripts were extracted, but the PDF structure itself is designed to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/b036744f0a5ef05290ee8c8579cf24af/24564245645.pdf In PDF document text
    • https://gikguamerica.com/userfiles/file/pabawiri.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/fozepekesumaxesi.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/96783870436.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/27153291973.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160de0a7d91f88---baxeduwavofi.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a424a45b6c0---bodideraxadapivomude.pdfIn PDF document text
    • https://nistd.in/userfiles/file/99404786531.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/jatofukupasu.pdfIn PDF document text
    • http://robinsonfamilyreunion2021.com/clients/7/77/7769cd5c98d63cfb9738ae2db1c5c42c/File/gavorujimegovigewepejal.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/1e938ce44725888c8d6b6e608258cddc/xujipo.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/wabutaba.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/7992365950.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/99416732285.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/177e6266d2e80c34ba08e0da4b32df19/67443938023.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16085bf6154cf0---16728440664.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/sunedojewupowelerapimezer.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/67947842389.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/he0nralcrl60o0sftat9dlebb3/21935878520.pdfIn PDF document text
    • https://artbynela.com/uploads/file/83081593728.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/bm5tb60og1v207dubqls1leck1/24540775384.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/mezig.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/lulibotujonug.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/181750514611.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=exerc%C3%ADcios+de+ora%C3%A7%C3%B5es+subordinadas+adverbiais+com+tirinhasPDF 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_off0000f870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF870 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11082 19536 bytes
SHA-256: 4f2daf93932121cee40d46263a77786c5cc3ce8bb78eb8f1f3b5c112f2f50d36
font_02_sfnt_off00013f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1B 11464 bytes
SHA-256: a104e0d85c1041055482ccb0d2d70237018f2a51a340c472cea194a9bfc2b9eb

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