Malicious PDF — malware analysis report

Static analysis result for SHA-256 53201f7778230371…

MALICIOUS

PDF

72.2 KB Created: 2021-09-08 06:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 983d010508b7306ed420583f8fa92571 SHA-1: b10c8700e7ebc34fba6334253b40ef8e27c56ac4 SHA-256: 53201f77782303713f75b5d0f241d653966ca1c1c13410b5f16513b32b67d993
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript indicates an attempt to execute code, likely to download a second-stage payload or exploit a vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=permeation+enhancers+for+transdermal+drug+delivery+pdf PDF link annotation
    • https://anpheatingandac.com/nbloom/fckuploads/file/30791289475.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0a50362a3---waleki.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609823d9a9503---tamij.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/gejazaxedovav.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/93302112082.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/78571727156951d7edd835a729ca8f30/nikepunipikikigozonel.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/mepaxixutubi.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/16123349172.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0cb206207---78900049413.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/75138280237.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/tajiwanesorumebimofitatib.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/futopokaxubudiza.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/dc7282b39d10712393edec5deb039270/19083470233.pdfIn PDF document text
    • http://palami.by/images/file/48465257197.pdfIn PDF document text
    • http://schokobrunnen.com/idata/mufumikuw.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/86447337939.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/d6f573ffdf30a62a6170ec421923d145/91054983180.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/37aa15367d14248e05f157f927814ddb/mubifote.pdfIn PDF document text
    • https://ratsimae.eemedia/contents/file/53867641141.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/51225118484.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b148afc1599---jofunure.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/50840016177.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ctqtsoi6u2sju9bn465ogugnk5/37085759950.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/fefavuxipusumojado.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/6gevjs6r0n3tneakaossrno242/61689676587.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095308ef17bf---8880594899.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DB 15696 bytes
SHA-256: 87f2db84a384cd16f245f6ed0e226b951e802b0adb2be9767bb94a73297bf949
font_02_sfnt_off0000f8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A6 11348 bytes
SHA-256: cbf4114e4f9c53942a09c40fedefd0d072c26040c6c45aff65803ca74b5a21ad

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