Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba593504883fb0f…

MALICIOUS

PDF

77.0 KB Created: 2021-09-20 19:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c5e0cc6fac145615f7c984cf95082238 SHA-1: 980654baa0385e65955faa66881cb7f643e56b76 SHA-256: fba593504883fb0f6ddf5b950db2f8f7b240f0ea3e78497aa0ee3154c9b2fd0f
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the link farm behavior.

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 https://adikmanis.com/contents/files/79602782418.pdf In PDF document text
    • http://educasters.co/ckfinder/userfiles/files/jiforubir.pdfIn PDF document text
    • http://osayit.com/images/file/jonedowawakogik.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/samibedepidabo.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/wulobetazutu.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/buzusenag.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/kutefagemi.pdfIn PDF document text
    • http://alptw.com/images/files/75161703185.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/60928625520.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/56444741331.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1d19e191c61eca7f6928d55e8dd392b8/8536695320.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/lb0fmpe8gnrgf6rd5kl7vdnhu4/89043522810.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/josavimulekemosir.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/tafelirixifilura.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/44946973336.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/18074326312.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/92398114854.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/rilor.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-10/20210910192654271318.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/padivedizulusekix.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/56606184127.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380047d0883---wovetogapulali.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/duxemik.pdfIn PDF document text
    • http://tulga.ru/editor/files/96520285791.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/37774451851.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/64098054856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=learn+sqlite+for+androidPDF 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_off0000c647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC647 18548 bytes
SHA-256: 9c4278f6628445eb2eca6de201ad5c9c82deb3c1a929c64a205bbc7de7aaf365
font_01_sfnt_off0000f6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F14 10448 bytes
SHA-256: 7f1528b6eb4ce9effea86c7571e20b790fb00cbccd2ec39a1e9bb1a6a211fcf2

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