Malicious PDF — malware analysis report

Static analysis result for SHA-256 591353b601cf7d3f…

MALICIOUS

PDF

85.3 KB Created: 2021-06-28 04:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 258ec3cb345591b7cd76e472ae0e1013 SHA-1: 7746b30649fbf8cd3fbfbfc4e946537e8d643db8 SHA-256: 591353b601cf7d3f33d57fbaf9139710afcb1f630694ea1d5142df6e1e285f36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file functions as a link farm, directing users to various external URLs hosted on compromised websites, which is a common tactic for phishing or malware distribution. The presence of numerous links on disposable hosting and compromised CMS uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=is+my+car+automatic+or+manual PDF link annotation
    • http://miroslaws.com/ckfinder/userfiles/files/63059924772.pdfIn PDF document text
    • http://goref.ru/files/file/73551048119.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/92854892191.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/mtvsvpnbrepftmkpiiemdb1bil/65351822231.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/tabokuwozipixopagekuli.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/tmm5cok9q5co75ks3cgdr6ml1c/dirozo.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/nretguau06rjh4jfclu197mumi/8187386792.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/d67c482fdb24ba684fc5c81a76d02000/zosadukomewulona.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/0520befd50368d722b35321c0002c7d2/wevavudumovaxirowogeg.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c511c020f45---xerizalegoxizatuwosopivex.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/e0d03b0acd49379f4aedd8f160c78b61/bepuvunirabigu.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46372a240a---12346768820.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1b1388c5d---sulawika.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/litaf.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/18e67af8e37ae39dc094dab347a89ef5/kewosuraderegid.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/xuluwoneguka.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087318a9f77f---24869098810.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14e1531665---42846246517.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/jq5o41ps9hfskabgpbipkel0i0/kesunukodupovodutovawuz.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cd80451ac---voluwodalijubivujetikiv.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/d4acaa818627b9d025d889b8f4e54e53/3090294068.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/b62o31b9llfb3408vp3k7gqjqu/99653176778.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/bcm3icg6e1el49hc31d5gv6vlj/tubewawun.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096acd772abd---tebezifekoz.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_off0000ed6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10581 16504 bytes
SHA-256: be1d8f49d3675b0df2c3121777a8371b68d8a1292a25c77200d8afa7f3d0b456
font_02_sfnt_off00013056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13056 10424 bytes
SHA-256: a2c1a9792df6475118205c102f2aa6b0ac552703ac1ba4e5fcfacc05cab2beb3

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