Malicious PDF — malware analysis report

Static analysis result for SHA-256 305aeabfedcdb1c4…

MALICIOUS

PDF

77.3 KB Created: 2021-09-16 09:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ef5227396c16da2b2d5be38039511b64 SHA-1: 3b9b3b0c33b94dafe4f0f9dcc2d68f6f1055529a SHA-256: 305aeabfedcdb1c4761bb0a39d0dba359a0132e5e5b403f87cb524b2aa19f181
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or malware distribution attempt through a network of linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://taxfreepoint.com/file/lefesatabejujib.pdf In PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/6841650382.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/pibidikavogotibizenuzu.pdfIn PDF document text
    • http://iccarrentals.com/files/file/17959953295.pdfIn PDF document text
    • http://philipsphotographystudio.com/13352155214.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/61627455395.pdfIn PDF document text
    • http://rs-entp.com/upload/file/ginilagifugakow.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/73883861436.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/fubetusek.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/58579365130.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/fenoxusunoni.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/65132496259.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/19787205492.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/17043980623.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/ef300a84627aa14f145fc8d9ffc5f9c7/vexegujetajedaguxejudum.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/8uq8t6gi21u8tbk2v2ruje7kn0/943633879.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/lejikera.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/nubusaxalewop.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/90639947247.pdfIn PDF document text
    • http://askaudit.ru/price/87558128634.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/56408763895.pdfIn PDF document text
    • https://keongracun.org/contents/files/repunak.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/manolulevijek.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613034ff10b9d---63651478668.pdfIn PDF document text
    • http://didula.ru/img/file/23194901348.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/74928746689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=pcsx2+emulator+apk+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_off0000c560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC560 11084 bytes
SHA-256: 1a41190b962bd95bf2c6dbff642e74d9e7e4a432d27375f6f66617e99c6f4468
font_01_sfnt_off0000df66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF778 18548 bytes
SHA-256: f89201658c486ac544c14b617be6327133f1bee48816eb78b1281dc64c4d397d

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