Malicious PDF — malware analysis report

Static analysis result for SHA-256 326b27ff566654b0…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 07:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cd5de0e7d192d731a735144221b36785 SHA-1: fab492084614394d6592e384b5a79b2be6b29994 SHA-256: 326b27ff566654b0ee3b16c8442a75e2594fb4e0f9f69ef58c65df77183b2074
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports the intent to trick users into downloading files. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=bewafa+tera+masoom+chehra+mp3+song+download PDF link annotation
    • https://amd-export.com/site/upload/file/bokoj.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/namewisufugokulezazu.pdfIn PDF document text
    • https://birotex.rs/images/files/62172194764.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/93944891265.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/11363834475.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/makinapavizez.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/66098978087.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/56120270850.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/dagojamadekov.pdfIn PDF document text
    • https://istanajp2.com/contents/files/22000861239.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/tonerigilodu.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d01e84f7a1---67188846583.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/kikujuledutiviguke.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/2810469844.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/34626152384.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/35452039869.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/310050966.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/bokanavegifoto.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/9fr3q22ldefaqm1no5fkk0lusq/31733872509.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b7a12779417fc75e6f3268d68c945c55/ziwikimupowuvaridixafuf.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/zabipufapozum.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/706494qonu2dkh2cind5en9hr7/kotapewerubiludulokoxenod.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/22709458259.pdfIn PDF document text
    • https://12waktu.com/contents/files/48827441664.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/45910047.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/pufakonujisogosat.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/80703789712.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/1j6kbasrcqtdg1mlpid0ivmnv1/numif.pdfIn PDF document text
    • 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_off0000c996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC996 11288 bytes
SHA-256: 624b3db11223f3e71c0f0ab2212bf6d9bf08dd6186a76dbed63a4a5ff59bd2f2
font_01_sfnt_off0000e3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D4 19576 bytes
SHA-256: 5a92f6f47cab5f8e1ec8356b50316d91bb344a34b3f0d2c46919ff13685c3059
font_02_sfnt_off000117d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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