Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a52598255c25f6e…

MALICIOUS

PDF

78.0 KB Created: 2021-07-29 22:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86876f890efdda060ec9018b661caa15 SHA-1: b8a6655345ec71708af27f6b5c659a227c40e192 SHA-256: 6a52598255c25f6e8479ecfc49f29eeb56b3c9dd77548f8540783f9547430b80
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution campaign. The file's structure and embedded links indicate it's designed to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://allytemp.ru/uplcv?utm_term=oyun+havas%C4%B1+mp3+indir+dur
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f9ca82b76---bakewurufapefi.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/fp100tr7rgvqfu9vhheqebk9o5/xopakomezupajosizezoweso.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f3be316ffa0---95496785790.pdf
    • https://imaggu.com/ci/userfiles/files/30003874256.pdf
    • http://giasuminhtam.com/Images_upload/files/pogokuxonegefox.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-1/20210501225146278518.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/qu49tt1t50b3ukr11ot9lcjrf0/81474708137.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c62483cd5e---7952518229.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070ef603b666---56966134360.pdf
    • http://vvk-wiedermann.at/userfiles/file/77595838182.pdf
    • http://funperm.ru/content/file/28950523887.pdf
    • http://amirafouad.com/uploaded_files/file/kamawotifaramufob.pdf
    • http://cepsagibyachtfuels.com/images/photos/73962603447.pdf
    • http://hiddenforrest.net/clients/76790/File/nejuz.pdf
    • http://dringraldi.com/clients/7/73/73ccc230e5ee2b020474e4a43bcd07af/File/36483876889.pdf
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/13052568203.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/1e01a51ce6015dc81b725903c13e679e/98850255083.pdf
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/xugetavivonidojitidixewoz.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0fcd6a80d---zufar.pdf
    • http://goteneplast.se/files/images/file/vedolab.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/834cj2s51odp3nps50lfmi4g55/zoruxarukaruwumepip.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/fd06a2ab4c457f5159aa2e4a4ff1444f/mosesekumimoxomif.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b80c5f3f517---gedibobakedepilosatuz.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_off0000cc7b.bin
f4a37d57f03512940fdf79bb179e147badc10af02125821151f43ce398d78c13
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7B 10784 bytes
font_01_sfnt_off0000e524.bin
989cdc66e8b9c77e235b91d41158a0f6be026fc551b8e6f4b092abb6f89bc186
pdf-font-stream PDF embedded font (sfnt) at offset 0xE524 17720 bytes
font_02_sfnt_off0001104d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1104D 16792 bytes