Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e642fd9c3013f2…

MALICIOUS

PDF

79.0 KB Created: 2021-09-01 11:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0ea703e88a4b2daa667a955497c12db8 SHA-1: e9fb466b4093192747ab664d3af6fa36bb150046 SHA-256: f9e642fd9c3013f2a88f211082d9f7826414d4169cd3fa7cda264db2d842a4bd
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs hosted on compromised or disposable domains, which is a common tactic for phishing or distributing further malware. The presence of numerous links on potentially compromised WordPress sites suggests an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/9e96314c53a0637e1c5952488992d92f/pufobomiminugemab.pdf In PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/c59a3831cf58431efd4ef3939614bf6a/96900752615.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/i0uj1k6h0cqui6l2jq1m4orfuo/rosivubi.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/d6286a85da80ee2ea82aa762a1fb38e9/33074402947.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/lixiliw.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/v0kbf4mjg7j2e30rk5sdcc3fqe/24175491176.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16078ccefcf3f9---jiludelejize.pdfIn PDF document text
    • http://canoeing.by/pics/files/21460349750.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/85288219255.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/93434832176.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/pabavemibodeb.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/sanaradinaf.pdfIn PDF document text
    • http://apcmagon.com/userfiles/sazasitubarugerojowizub.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210827131145.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/9cc9512b430273a07231660f79ce3dc0/77057865823.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/visivarok.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/wosetowifukakirojubon.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/5mrkg99uga4mth55aqjgfsirm3/fojapurebadexevode.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b97fd2e50a---90472432806.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43775088396.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/61112477874.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731e3aaef9c---48084839416.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210825013056.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/79408375701.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/6832782c19b07cf2ae90f36637998b0a/57527656802.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/101429f41ee8d8e180fec1945f64f04d/6190680363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=lincoln+mkz+owners+manualPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/78131097928.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_off0000d1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B4 17272 bytes
SHA-256: fa68c700c79ed90d122d70fdfc6203bda749c227a4a857f62a3fc67857af3cc5
font_02_sfnt_off000115e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E5 10588 bytes
SHA-256: e9842ba613c46583e668bb08f4128a83f2e94debed670defea8371405f1e546d

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