Malicious PDF — malware analysis report

Static analysis result for SHA-256 f96662bf31b7ef68…

MALICIOUS

PDF

97.7 KB Created: 2021-07-04 06:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8bad105a1c2e4b757bb3869bc7235381 SHA-1: 84f21146538a3f6bb2fecbeda51043aa26bb9df3 SHA-256: f96662bf31b7ef688717bef46b4995e01280d9ce24fb8c98f708eea05281ec5d
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs hosted on compromised WordPress sites and disposable domains. The presence of numerous links, including those with UTM parameters, suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://infrive.ru/uplcv?utm_term=success+is+counted+sweetest PDF link annotation
    • https://acronimocostanzo.com/userfiles/file/75143430928.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/cd585e9f9320cd54989a38742e72a22c/kegugavazasu.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/og2k4r056kg4j4s858g00n3nr7/tizuzeregumopepidozasine.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3761f9b040b3ea12251f2353d757f5cf/88740002278.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607105ec9b71d---26875190318.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/75132994112.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/6a0cf30bea7bd5384751dbc3b567bead/82330362520.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e812efdbe---komejinagezamuwosorozowow.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/6baa1c8dbc501819f89d934d854cc60e/begenajajotafuzozi.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/32762566858.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/3ruqloqbvkvb7ht2p257ucigcm/65408550802.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/jenerenuk.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/f636ab4fa125e7c1080eb3aa879da46a/98177086838.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/jurb2t6r4d278quluao8ub0s54/rufuxoravijo.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/bfb8db89f7c7f3008e31d95bfcfc7515/pulanegomalobalizipewoxi.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b519c526e40---88314312410.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/73c410e1980dede7b2213edb62b4364c/voverobepebigulivomigal.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/9b7a94f60630201dcabf7a5d8e8df7e5/83708899809.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/mmtc5ceca5n4cc8i230ok7lm02/lebobuxebijokugubegosiwud.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/tidalikurubigarupuxuwe.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3f1b7adfa---25185385412.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/aaaee1bf7bce004c55533040c7978af4/wubovudiranujaxig.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/wavemodotewipidefubav.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00012f40.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12F40 17900 bytes
SHA-256: 7fb28d945cc86faa47ded9147c6632ed93ed83c4e71b7274814666ada5e2f9a1
font_00_sfnt_off00010076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10076 17860 bytes
SHA-256: d46eb705fffd0e3a865a51b27546191100bab3b89c2b0fb6d4df60577b92903f
font_02_sfnt_off00014add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ADD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000162f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162F4 10316 bytes
SHA-256: 29aa7004c18106c516c0252fba94669c9f73bebb4a6d351756d88271c954e1b0

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