Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8de89d77023729…

MALICIOUS

PDF

85.3 KB Created: 2021-07-05 06:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad21b4b9913f1cef7e1fd97756dd2c0f SHA-1: 8d1b875ed786ff68cf66fa684c24a54517fd7cb4 SHA-256: 3c8de89d7702372927f4e64b1b720e9811a04cf0f0b401dd302851e212565e56
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs, many of which point to disposable hosting or compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of a raw IP address in one of the URIs further indicates a potentially malicious infrastructure. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://fly.no1-yes.com/userfiles/file/juripatufifuzifov.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcbcf23fc6---76963314165.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/v5id5oapttbft5s3p42ecpd6r1/vixigimamet.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/069f9496d4bc4165af086529b1775b22/33953634622.pdf
    • http://2ds-creations.fr/userfiles/file/vuvitabojovasazubowe.pdf
    • http://globeksa.com/ckfinder/userfiles/files/gugoniwodowenanavaropi.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5732fd0924---71746997349.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1e10e7957ca908477de3ba8c0a0d84fb/14767875646.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/0fdff0fc1746521eaa975f5a0c5aec8b/930343538.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/8actco30vp4eas4uebp4ns93et/gitebimebuselowinenekupu.pdf
    • http://icmasistemas.com/userfiles/files/xopep.pdf
    • http://bukharasuwanee.com/sites/default/files/file/6546698633.pdf
    • http://brainerdhs71.com/clients/0/08/084bd9d902c6a1e3ee48703551c87841/File/26843007894.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/d75a6ab1926d929f663018a45c99f544/tinulilivudap.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a9c784dac---12497956677.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a068db9c64---gapulumikofaletaj.pdf
    • https://actorconseil.com/files/file/83916866634.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/d63a9386675a9ce8eab153a113cc357b/90030865407.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160816f800f76a---7621733263.pdf
    • http://wisdomtours.net/upload/file/18942435820.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cd8bf0414---rifejanopafewuli.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb78e35060---volumogejonir.pdf
    • http://157.230.241.115/image/upload/File/pirisiwebufisovixiruk.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/9ec13e009bd48d3f269d04af8eaab4cb/23566317657.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e1a7a070f---rajinefeje.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/4360e1820a4f1e9670f5044982301103/13935607791.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=hot+dog+fingers+with+fake+nails
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea0d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0D 16792 bytes
font_01_sfnt_off00010224.bin
ca37381a27d191da90268d2c55e2f1627a3ffb732de03a0ec5536c91033a81fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10224 10804 bytes
font_02_sfnt_off00011ac7.bin
1a7bf411df394cf8c35cb062ac73e8608b880106332b1b9ebf214160c755e6b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC7 17180 bytes