Malicious PDF — malware analysis report

Static analysis result for SHA-256 e27a8b2cfc9989ac…

MALICIOUS

PDF

99.0 KB Created: 2021-07-03 15:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c567463dcbfa10f096f6724a84d6c5d3 SHA-1: eb092da1e550e34d7c02242a8f93364e751007eb SHA-256: e27a8b2cfc9989acbb2d39ba5d8d5d7679dea32cc963b62d868fb15c23606ef7
196 Risk Score

Malware Insights

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

The sample was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it is a link farm on compromised CMS uploads, specifically targeting payment redirection lures. The document body is heavily obfuscated, but the presence of numerous URLs suggests an attempt to redirect the user to malicious content, likely a phishing page or a further payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bdadedafd---20545457601.pdf In PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210529012531.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4c777a5c5---99029137151.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607749ad4a1e2---panigekoganisaj.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/a6872dcf310af0ce3b7ff42c1bb7fab2/48344409847.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/120627544587.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/72jnpubbr6e52ns6kp1vulh771/poxuduvulejobavaxoba.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/ac88b17c7013b136696d16cfa6b579f0/megizelorisu.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/2b4a8c2b46eac26a30deccc65d9b114b/mupikiwejetibuvora.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86b198710b---paletuvalumipepulojit.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/nonuwis.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9176e798c---fonipuv.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/590e9f02c59516fdb83c3b76e179b8e9/noginot.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609006113c3ee---pifimereredevezovatozu.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a565943a565---filixokagokut.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/01c4a4ddd5e1e239f49f0d65f8c7caa2/15757051335.pdfIn PDF document text
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/53217465560.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cce2be3d48f---97082364492.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/3df4d2f8f8c5562422367df8457a7000/82895168960.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/djo9eg6tun4apnfuulacdqmerj/19290999019.pdfIn PDF document text
    • http://scro.ru/pic/file/fosatu.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/fb7dcbc7f14cb3e2fbad91e736376dec/sedewafekiwilasazopo.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abd7e618d8---26768007669.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/gexifagakexe.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/31me8rjnu1lleebldlj8pg3l2g/34612665250.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=old+401k+to+iraPDF 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_off0001218d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218D 10208 bytes
SHA-256: 7bdf1870a11928a97a925b4fbb191301e89745211e744756ddee1131a251db6b
font_01_sfnt_off00013885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13885 17236 bytes
SHA-256: 5be6caaf39b046ee25641222db43c736c9e64abad9730d07c20b58fbe110a8b3
font_02_sfnt_off00016575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16575 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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