Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d3ba51cbd4cc932…

MALICIOUS

PDF

92.5 KB Created: 2021-07-25 07:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8074f8b32ac5e02d5f8383135d0b96cd SHA-1: 24fdbe1625781d6185c61fc6d29f0a7a6fe0c0d8 SHA-256: 2d3ba51cbd4cc932544daf37cda774def1a6ba41b49e3bd557696fa389bf0177
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics identified the PDF as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The embedded URLs and link farm structure suggest an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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://z-i-f.ru/userfiles/file/537519792.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722e8303e95---84142914901.pdf
    • https://loctra.net/userfiles/file/32563055282.pdf
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/ropiwawifiwisedoxizeku.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cf9881fc5---60807263791.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/1465982b01306cc96112b70bd2191f7f/73391716438.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/38e634c9e02108c0b847f35b1f1be7d6/fifofakesexinezukewat.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b58e629145---mupuvejojiwonigiduno.pdf
    • https://alshamiltrading.com/alshamilfiles/file/rimijap.pdf
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/81705894330.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/s5t4ng9b91t0f1csl6101e1tkm/45217047432.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/b2to5d8arpbe3653ie96gguvc8/ravijonuxugavuberizavuj.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/j6sk0fis2b45echtpb53h1rf9q/zijejatebilaborenego.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbca53d25a---9015191078.pdf
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/bufurugupasemol.pdf
    • http://language-coach.pl/uploads/files/92590568209.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/i5c29sgggntivuuuo0igmlmi36/7410047267.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c437b40e021---xepigubozikunu.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/41ee3e65678fcb92767b20411d9143cf/merobijux.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc9f8635a8d---65796400083.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160829ca08b5af---97476025922.pdf
    • http://aarogyamedico.com/userfiles/file/kezuwenopexutikifa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=el+libro+de+las+sombras+migene+gonz%C3%A1lez-wippler+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc5e.bin
f09f15687c8db3a858ebb8b1afccc29b08bdbfbc58750a6f4375074179d32e28		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5E 19832 bytes
font_01_sfnt_off00011013.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11013 16792 bytes
font_02_sfnt_off0001282a.bin
b2f092ff6bfb9a3b6da8f2b3df3fbd40584c57dadf367e7bc02dcb36b10b59a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1282A 11224 bytes
font_03_sfnt_off000141ad.bin
214ed2e2af245715abe648eb52c5324759ddcd62560140832700db3f4670389f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141AD 1720 bytes
font_04_sfnt_off000149cc.bin
eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149CC 16132 bytes

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