Malicious PDF — malware analysis report

Static analysis result for SHA-256 08fef5a1b6ae0ecd…

MALICIOUS

PDF

78.7 KB Created: 2021-09-12 10:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dfc92b24f5ec54008b7ca638b603d055 SHA-1: 58b121266500895792e7d4369a1e4e681cee4f41 SHA-256: 08fef5a1b6ae0ecdc280396fffcc9a4cf42eee6000f489fcc1e41ae8063acc22
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a link farm with multiple URLs, many hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of a Google feedproxy URL with a 'download pc games on android' UTM term further supports a lure for potentially unwanted software or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://acupunctuuryao.nl/ckfinder/userfiles/files/jowasil.pdf In PDF document text
    • http://phuketdriveschool.com/userfiles/file/4521558971.pdfIn PDF document text
    • http://stefani.cz/fck/file/gapatifesoj.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/a2163d0c9204eeb806a50b2c2182c43b/piwugugotuzezanumunuxepez.pdfIn PDF document text
    • http://espokebar.com/uploads/files/78870489927.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/tunupokabuvef.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/kolabezagemugis.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/54775336356.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/vadanerulu.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/nituzozobatiridugusad.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161306e6fa33ba---43079986740.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac844914be---vujujorimiferuziwe.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/zikanemoxoj.pdfIn PDF document text
    • http://chinahongji.com/d/files/74530178637.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/38757548799.pdfIn PDF document text
    • https://mediaskills.rs/files/xamatatuzire.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/dagepoleverevaz.pdfIn PDF document text
    • http://4bx.pl/public/file/28371412975.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/semefuvadolitibelejef.pdfIn PDF document text
    • http://med-os.com/user_upload/file/80730404118.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/nuvigelule.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/bugafefopu.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/teweduvoxuzemo.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/89914843312.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/vomipoze.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/fukefikumaseg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=app+to+download+pc+games+on+androidPDF 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_off0000ce3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3A 17688 bytes
SHA-256: f42830649167b3312a7214f29ddc7fa13533378c98a340a842b54471572699e8
font_01_sfnt_off0000fbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F8 10924 bytes
SHA-256: e579b1c494d0e16f5bd11ad04db4f06b24f9bb48bf651225d10dc071411f97ff

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