Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d14f44054cd27de…

MALICIOUS

PDF

125.8 KB Created: 2021-07-26 17:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b95f8cf3f14016a6d519695731c689fd SHA-1: f5414a157416ea0d93923f1f95914477be9d1aee SHA-256: 8d14f44054cd27de460c487f52534643570a17ced04a3a6754ea0ceaee73e4db
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads. No scripts were extracted, but the PDF structure and embedded URLs are sufficient indicators of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f12c236cee---polabex.pdf In PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b689b755300---57681006554.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160abcc597f02e---pivanusexowolodinovojewos.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/34810oaqgl0kpgmfk3pn791g85/46531293670.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/50224762296.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/negixom.pdfIn PDF document text
    • http://canvangdientu.com/images/file/62475026108.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/6425072846.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f238865f0---49015102896.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/kugusujabulovi.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8015069471---pavejozifodege.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8678dedc6---64539172738.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/6cea72f399f9bd42bd03a1deda5d3821/43958878472.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/cb27f49f46335f6ba48295b8202c1e4b/zupuzobubipolemibunob.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/08c5c3cfebde80b9d7d1208b21f967a5/83037820535.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079aca3e9c43---28360970046.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/baxotudofajalegovenumi.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5361a4f048---turosekoperevenepifurifuf.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/31565170798.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/582a78a85b5d0952a6deac820fc59917/46361973387.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1126028e0---binimupivebewesuwagejes.pdfIn PDF document text
    • https://mojer.bg/files/9936322773.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/52895900439.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/5074d62bf89c9842824bb4df4bdfc53c/81234371532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=racism+quotes+in+the+house+on+mango+streetPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000184d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184D0 10920 bytes
SHA-256: bfa6f96fc80ff1fdc4c4040dc8bf835e7ecddd84ce89c3e287c4548a32c662f0
font_01_sfnt_off00019da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5B9 18888 bytes
SHA-256: 572fdccab96e3301d7765975ce036e687ddea6054ead8d75764da7f3c4123728

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