Malicious PDF — malware analysis report

Static analysis result for SHA-256 83df00ae4472c186…

MALICIOUS

PDF

87.2 KB Created: 2021-08-05 17:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5cf309aa2c1482077d136078650a1833 SHA-1: 7877a5cbaa7c5271158a2634d5c46dfd623b2c06 SHA-256: 83df00ae4472c186744e4a2138e67b22a58da855e891de64a2c1769bf7521ae9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://vetregistr.com/ckfinder/userfiles/files/vevoretawen.pdf In PDF document text
    • http://animalscipublisher.com/files/upfiles/file/63694929254.pdfIn PDF document text
    • https://masukpt1.com/contents//files/25457451613.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16098a8a27321b---dagex.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7ed7e63df3---93665037314.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dab928ae158---xosugovalumaxaxinexofivi.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eda0576f94a---4534244103.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/zavaduguz.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609933484bff7---50583504172.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841c35385a3---45888684868.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/43531075604.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/ea2d744ee7b05cad8ff5919df057185b/72611023707.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16080efc330256---texubusiw.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968dd188ece---26350842509.pdfIn PDF document text
    • https://agatanorek.com/files/file/toxikaxarijafalomanovi.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/vapaliwutiterobexo.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/mofewizukuxoxob.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/nawurafes.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/896302372e8e1986d77f59d328ce8c02/madupiligemadisi.pdfIn PDF document text
    • https://migger.dk/userimages/file/60406081984.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/93c2048fec49af426ee433ae27637190/togezanejaravumezimuv.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/vareloruparimozi.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c87d639b430---96089404525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+fingerpicking+guitar+beginnersPDF 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_off0000f140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF140 17216 bytes
SHA-256: 411b09686c57bad9b62900078376f8c86052263c6eeac68aac157dd79821fdd0
font_01_sfnt_off00011df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13607 11016 bytes
SHA-256: bd08c0512e983560e14d4407d86808045dc635a48b4ad819f2b5829fcbc88da0

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