Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b87f75130020e5…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 23:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bbb3100b1dc1cce52f792a30b33f2160 SHA-1: 6e4f7a51ef736521fdaa05cf10dab09e43f72e92 SHA-256: 82b87f75130020e5e8faf0b06ee579801ed0423b12276f80512531ff303d5af1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of URLs with 'utm_term=credit+card+information+generator+2021' indicate a phishing or credential harvesting lure. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://wastran.ru/uplcv?utm_term=credit+card+information+generator+2021 PDF link annotation
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/fh45uikb4ejdt4c52q09nihul3/28910150239.pdfIn PDF document text
    • https://fobh.net/userfiles/files/gibisit.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/sofelelorivinovozoxij.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/35246149916.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/202199648371011.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/29799364444.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/80440572996.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/27646631992.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/poxuwokijef.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/60292202871.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/nexitukavitexasaduko.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/35213296875.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/23309174040.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/7369188904.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/nakamajibuvamusuluto.pdfIn PDF document text
    • http://etkenkalip.com/files/vepumunusatam.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/r5oe1te6rn3dmbid5fskp1llds/52421250281.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/rujotisanuzitipeson.pdfIn PDF document text
    • https://eniedu.com/data/file/20210903120923.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/86870819645.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/91793745552.pdfIn PDF document text
    • http://abworder.com/uploads/files/38795102622.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/nufazalak.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/65052727128.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3bfd603b5---gurobabugafovu.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/6t7l26hb22v40ctskd449eljg8/jalesatotokutagibojamid.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_off0000e203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE203 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA15 17132 bytes
SHA-256: 389e64414d5c207e8860309d1052e2270e76a9512c137f6582428fcf4dff6194
font_02_sfnt_off0001267c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267C 10932 bytes
SHA-256: 61a1b8e1f5cb8d70a3a0b0a52892af518d5ea2f3c78d04f06402d8a111328f98

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