Malicious PDF — malware analysis report

Static analysis result for SHA-256 d600159332ac6d2a…

MALICIOUS

PDF

80.3 KB Created: 2021-09-14 08:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f3b510bc78fa16906b4ab76b637a7ca5 SHA-1: eed1411dafda479a401d0b47f746a0cd5d066959 SHA-256: d600159332ac6d2acca7ca5be57fe1447c1c06c95397fe8406defea5b2105729
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting domains, likely intended to redirect users to malicious content. The file's creation by wkhtmltopdf suggests it may have been generated programmatically for this purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://flyingwedge.com/uploads/assets/file/rejexunewivorinolemor.pdf In PDF document text
    • https://atlastoursntravels.com/userfiles/file/91478336113.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/73362892330.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/kexowinosisurilot.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/rovozimizizivutene.pdfIn PDF document text
    • http://generaldistco.com/images/file/38707002095.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/73205351811.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de4358f015---nifitipir.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/xidapufupulumupidabasav.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/95971589357.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373dc3a895c---buduxepelugoguribi.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/zulebofuxatinegonoke.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109060153167142.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/jilokadebagimoxixunal.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362d42170bc---nejivumitezedavogadatupod.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/kunoxap.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/povunusuraperov.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/75531854305.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/72187454966.pdfIn PDF document text
    • http://xsteelstock.com/d/files/libewosawuworaza.pdfIn PDF document text
    • https://venus-forever.com/image/files/kenolapor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=mi+box+stremioPDF link annotation
    • 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_off0000d58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58F 10192 bytes
SHA-256: 0e26f23a3be3b23c9523be71f5a0cc80e71f351d4ff112e6e121da692491a318
font_01_sfnt_off0000ec7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001048f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048F 18368 bytes
SHA-256: 17eafb186b9afaf7ca9fdab3700e9b77563d4fd10726da26dfb099fe05af1a23