Malicious PDF — malware analysis report

Static analysis result for SHA-256 80fbb16b74c858c0…

MALICIOUS

PDF

86.6 KB Created: 2021-09-09 22:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ebb814d73a77afde0c8dc17d140d8b06 SHA-1: c6cf17aae28a557ee9a4d2fd7c763404f0483452 SHA-256: 80fbb16b74c858c02cb4d7bcc9c7fe3fa336cdcad48794d4be56b086b8f03e59
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, detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised WordPress installations. The presence of these links suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://queure.ru/uplcv?utm_term=top+junk+cleaner+app+for+android PDF link annotation
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613646d52d086---92658071443.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/fekenarevemewuve.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/9250983395.pdfIn PDF document text
    • http://kme-kme.cz/files/file/68873802647.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/4061229638.pdfIn PDF document text
    • http://villaroyalenews.com/userimages/masifudomomukibejet.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613270f3138aa---xiwanag.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d1649ecbc---sesenufupilutejenuxo.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613798d410860---weginevovivazelos.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///nigotizosilopufatipodafo.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/didot.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d0aa451df---jubumumeloropubexabome.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/3ee15d8b4cd118ff993289c54e27554a/nuruwoduparumixoba.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130d9bb7bc78---47572800616.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/13663496546.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210908153150027490570gv3.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/28577689306.pdfIn PDF document text
    • http://soupworld.de/upload/file/kelurogiv.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/1154218662.pdfIn PDF document text
    • https://avflash.nl/upload/files/bejivofig.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16134b8fcd3b1a---48833785040.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210902090001.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/sezejilekagadorekatinej.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_off0000eed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED6 17368 bytes
SHA-256: db85d45b9a1b8a665496d86ab4eed2100fdf838f163c120990d45461a8965894
font_01_sfnt_off00011be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133FC 10632 bytes
SHA-256: 307f96b94ae3afdcd62eda228f2e731eed383f2f31bd377e359df964d43e4e33

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