Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85bbc24b566702b…

MALICIOUS

PDF

70.5 KB Created: 2021-09-11 08:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d4311fe5213b954985931cd2962873f0 SHA-1: e2af5ed560550d56e9bf06dbcd00fcfdd8f62c84 SHA-256: a85bbc24b566702b9ac386554cb279ef86c006fab2bd49462404f262b687b9c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ahlhy.com/uploads/file/090916084950.pdf In PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/futanivusituk.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/tosesaxipaw.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137ddfdd07b9---ripuf.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/jubudewomomumamebagivudir.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/murubaxagefarovibalodarig.pdfIn PDF document text
    • https://dhrc.in/userfiles/file/semusabodugusanoni.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/32745363276.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/fixirekudolez.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/27763446977.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613033e6edda8---jojigoxorojijorivogajex.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/84989960363.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/zerevagelod.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/filifaparonulafub.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/jimuvivuravajatimed.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/66725629532.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/7pvoc0vun0m3mh1kkrsv27sird/nunugu.pdfIn PDF document text
    • http://heichapuzi.com/uploadfile/file/91936191360.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613230b5e6b4c---virozigoxokis.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/65113233463.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab855dc2f8---zaxuvadagol.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161369b46bb785---87398510907.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/zemarag.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/vaperutegavit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=great+h+wordsPDF 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_off0000b515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB515 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2C 10228 bytes
SHA-256: 759b7fd3fed290f50e24f1aa1e37ff1478a2b093d1d7f66c2ab752a1ddcb349d
font_02_sfnt_off0000e464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE464 15668 bytes
SHA-256: 89c626fbc4da2c73abaf78a271323ea7cd8b7869c5b1390a47b7e7a0f6b456c3

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