Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa1bed7221e99da9…

MALICIOUS

PDF

72.0 KB Created: 2021-09-17 15:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 70b3a2459dd5cfcafa5736f363a757b8 SHA-1: e7cc5706258bb8e47cda2e431d4347312d967b0a SHA-256: fa1bed7221e99da90ecca03c6485a81316883a1cdcbe6ae754637e8a3251c70a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs that form a link farm, a common technique for phishing and distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URI heuristics and the link farm structure suggest the document is designed to lure users into clicking links that lead to malicious content or further downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ltes2.tw-goods.com/UserFiles/files/13645574768.pdf
    • http://sure2trips.com/bot/ckfinder/uf/files/ketujiroviwedavusonabos.pdf
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/12392260676.pdf
    • https://lotusmarinevn.com/upload/files/dibalewilenobizugexazexu.pdf
    • http://aid-calais.com/userfiles/file/badizakamazu.pdf
    • http://oldmotorsclub.com/files/file/68502729165.pdf
    • http://h-st.nl/bestanden/files/pejumomuzusa.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/7545e1e4b7d2fea7be6179efaa2f2b53/52652872610.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613804f937c36---12152951738.pdf
    • https://tttinox.com/upload/userfiles/files/zugatejolujisuk.pdf
    • http://yournamebadges.com/withyourdog/cms_uploads/file/gomifovakuwiju.pdf
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/baxetibasonatelade.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136d877b3e77---85244114468.pdf
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/90691962505.pdf
    • https://serrechevalier-skifun.com/imagesfile/nigijalo.pdf
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/purinipiwajunidugexej.pdf
    • https://rajatotogroup1.com/contents/files/rixigok.pdf
    • https://ebal.ro/app/webroot/files/userfiles/files/32272747662.pdf
    • http://ambvet-trefontane.eu/userfiles/files/witixumesigetovegapuwesi.pdf
    • http://cukorbetegshop.hu/files/23180357086.pdf
    • http://annabarons.lv/files/files/givudu.pdf
    • http://atomicattack.com/atomic/fckimages/file/kovafibapiwe.pdf
    • http://debsecond.net/UserFiles/File/toxifimogujoxubisifaso.pdf
    • http://hoadondientu-ptp.vn/images/ckeditor/files/80222667730.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=download+flashscore+app+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b79d.bin
d35f27d7017cd6bbc06bedc96d577134b6ea85b710376a0ae09b01228de22340
pdf-font-stream PDF embedded font (sfnt) at offset 0xB79D 16472 bytes
font_01_sfnt_off0000e194.bin
86bdab39a99b6ce7ea2996aa2deee27b68c107ac9c3f37a5b24ad9ee8d63270a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE194 10704 bytes
font_02_sfnt_off0000fa19.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA19 16792 bytes