Malicious PDF — malware analysis report

Static analysis result for SHA-256 d393497282cd2020…

MALICIOUS

PDF

83.8 KB Created: 2021-08-16 06:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1a1d817041142671c625cae5e41d0909 SHA-1: 011d8b97fd31facd31758f2d3c0666e3569deb09 SHA-256: d393497282cd20205fd3436e1fd94a73e5fe436c0a0c3bc2cd66deeaf246e95a
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to various websites, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the nature of the document as a deceptive link collection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://anhuicrew.com/upload_fck/file/2021-5-30/20210530101923711653.pdf In PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/8dcabedf17dd49e687e9db1386ef2041/tixijapitepuxepafarig.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/5cfa98ce68ff686eef0cf3d0a6b2deee/biwemexizatutidaluti.pdfIn PDF document text
    • https://murten-hotel.ch/userfiles/files/81264114349.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/tirorexapazorijupepu.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b34740e1e4---28159030445.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/nixuramek.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/xasari.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/pipojejepotu.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/koxowizebefutitozekaxifev.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b9d9514b55454b278d47237acd3e06eb/ketojamoram.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608255411a7ab---kivobidu.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/pigaluludaba.pdfIn PDF document text
    • http://ithaca1962.com/clients/41687/File/borilosuxer.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/sotamu.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210814170449_53x519.pdfIn PDF document text
    • http://geasit.it/userfiles/files/pazomene.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/3502883568.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/52048327643.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/48342158968.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/77599441120.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f5c5bb752---bunajoturemimugimejubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=is+it+love+ryan+mod+apk+unlimited+energy+2020PDF 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_off0000e00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81F 17180 bytes
SHA-256: 29ef350ffafb26b512ca1cb50c20a42d468c397070a5928ca7e0ec8a655ec32c
font_02_sfnt_off000124bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BD 11300 bytes
SHA-256: 0b56fd65b92f57a716ee3b51a462dd8bf168d7823753d7f3edcbfbbeb5b72f49

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