Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf93f6540a1e29b…

MALICIOUS

PDF

118.4 KB Created: 2021-06-29 16:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 464670bf6d92b43027bad481ee849bd9 SHA-1: 4644f4497060cdfcfbeffcbe44ab76cd67407d68 SHA-256: 4bf93f6540a1e29b04bf8caba5afa3320146db4bbe57c1b4b2a7384d5116fcd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload directories, suggesting it is used to distribute malicious content or phish for credentials. The presence of embedded URLs and the nature of the heuristics indicate a likely attempt to redirect the user to a malicious site, possibly for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe2919d8c5---65229545728.pdf In PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072677778a0d---luribile.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210518155020.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/iq23bg2q9hsvqecgq0rouqenre/79795949274.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081080147b34---88555805064.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/84609879488.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/kijunuserurifowitebizifu.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13d64b647b---14181506352.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/fuzawesile.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/0pkvn2m94uomvjr89f14pkid56/vigelavejukemuposuza.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/besowawukib.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d0859b562e6---pojifexeki.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/movomubupekutafos.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/pemupemujipigabofixefebix.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/basafugunolewevawasi.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/nutifamowike.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/85202599797.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/xemerarok.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d7139bdcb---52492947044.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609abc2a3b08d---motasivodofegig.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606eed743d048---waforuposotara.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160accc2c4237c---libazerutegubiwovovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=everything+is+a+sign+book+by+paulo+coelho+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD2 11392 bytes
SHA-256: 2c6c7843999612757a2c5f3dea6c508ab3f9bd72bd4a9b715af46732925bd14d
font_01_sfnt_off00016538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16538 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D4A 20764 bytes
SHA-256: fe4f619a8d35726aa67cf9efdce77582887a00938f8a766d1af203a1d92807fd
font_03_sfnt_off0001b216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B216 16860 bytes
SHA-256: 2341df0b8268b31209b79551e6805a82cff3c026d73dd7680820e304aba94835

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