Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b68a3b14e393b6b…

MALICIOUS

PDF

84.2 KB Created: 2021-07-25 20:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7caa941ffb4d8ccd0944345b66788941 SHA-1: 169acea74b215335ee9e7cbc81961f3536e373c8 SHA-256: 9b68a3b14e393b6b4c8ed137747f4375816d2c19d49fa72210157a2215c218bf
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites hosting other PDFs. This suggests a link farm designed to distribute malicious content or lead users to phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/e143b87d562d25b4a831477a6eeb315e/depijenesawimididodifa.pdf
    • https://agrilaui.com/userfiles/file/31264524629.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/d920a9cf6b491024a93a5b325b53a27a/weligudere.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/e0b758fdfb05eacc5d6dcce0e688d747/90104786784.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24a4ac960d---32319171179.pdf
    • http://adamlegal.com/userfiles/file/mafiwumuvat.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afd3e3d9928---diwabedetik.pdf
    • https://bursakaynak.net/userfiles/file/57603303302.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607462d438f91---zigokuvoxetatafopopube.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160abaa01d014d---gesulimutawelowukarumuvu.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/137c370136031e6b1f2552cc14b3f845/zudumapisutak.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a01fd2de5c6---79120912796.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8e4a72f14---49549347929.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c74e52a02b---34030914247.pdf
    • http://studioturina.com/userfiles/files/zobakuravitevebazafutas.pdf
    • https://bdaudit.ro/userfiles/file/97226108695.pdf
    • http://tevukasveza.lt/ckfinder/userfiles/files/reginu.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/9acfec5a513a3086f4c31ef5da5c8ef1/koxezoriz.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086636ee96be---jodaledit.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/4578f135ae809ff8e366a3f32b175af7/fabopujiwatowinuwaxes.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/ic2tq8nb1dvqsrs3h0gfhr1j27/59143166441.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ed03df29d---32938795714.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/7b3f693d58030559469d4e4495247564/2138860161.pdf
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/rofagezevatebutamuseti.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=reading+comprehension+passages+with+questions+and+answers+for+grade+8+pdf
    • 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_off0000e4c5.bin
952e853cf17b457f91748a09d638d533ab1986530d247848f7ff272907d6a8e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C5 16452 bytes
font_01_sfnt_off00010f32.bin
28d26505666043dfdac30ba74f9c737dcb5d2c4cce80537ad0773414980874c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F32 11608 bytes
font_02_sfnt_off00012a1a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1A 16792 bytes

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