Malicious PDF — malware analysis report

Static analysis result for SHA-256 9286fe8b4c9d5a65…

MALICIOUS

PDF

68.1 KB Created: 2021-09-04 20:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ef37002489eabc93e62f0f780997e470 SHA-1: 16c82f85b953666d520a3593a5d9fe2d37315d0f SHA-256: 9286fe8b4c9d5a6523c1ada08ede6e7a126ebbdd0269a77396414cb1e4c1733f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains an image-based interface and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the PDF structure and link farm indicate a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://oniceh.ru/uplcv?utm_term=ansar+vdp+circular+2018+pdf PDF link annotation
    • http://cy2hand.com/userfiles/22760920624.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/83174016274.pdfIn PDF document text
    • http://turnyras.lt/Files/file/demokugufebagugewute.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/birizixiwukiwefu.pdfIn PDF document text
    • http://plncse.hu/php_data/file/piwefewogugudovejunir.pdfIn PDF document text
    • http://iccarrentals.com/files/file/solutaluku.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610c94f88fb0a---88416054626.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/vmlcoka47h12aa2d2c8igj0leo/41024846540.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/69983738328.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/93b587af33aced428d875521be9e74b6/19996634598.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/2111807746.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d939c99b7---sevefusijuzazoxujedeweki.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/geluxudifapev.pdfIn PDF document text
    • http://kunbot.com/upload/files/79116114000.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/56000630774.pdfIn PDF document text
    • http://vce34.ru/attachments/file/41136150050.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/2fc3dba14c52420fa7aebce3d2283c32/fasoxefetagadoxo.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/99075763728.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb773e3e2f---2204762944.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/nf7le2h5oiud6mso99jc2ul3c9/zimibu.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16126fd2388cd0---zedilegobetokapetuvilit.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/zovow.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_off0000adda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EC 14600 bytes
SHA-256: 88ee855c24d921d5066022f78a368c14001b02780e6b4dc24caebbb83a884e34
font_02_sfnt_off0000e9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E7 10912 bytes
SHA-256: 120874f2c51e8d61955511508fd6e0c4e38a0e6b0317b17df0cd323bca6e0bf5

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