Malicious PDF — malware analysis report

Static analysis result for SHA-256 bec7d79cb7e2e3ff…

MALICIOUS

PDF

84.5 KB Created: 2021-08-15 16:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c17695e859a4a40d1d6e01ad13c7673d SHA-1: 3e86feedac5377cf1562e1088dde3eeb15c8ecde SHA-256: bec7d79cb7e2e3ff50e4561d3412c3c8402a812bc8bc6ba381cfd42292226265
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d064c49f9---dajutupevenafazifozaluwa.pdf In PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/nojorufibadenepaxozefije.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/2f911efef1227c06c9bea66e93e4f890/zunovirokajenes.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/womesarunakuwusikevugifi.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4cc59d15c---14149099560.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16096ed2a3c693---notudovubodewap.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/51893908930.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/vuwowabinogujop.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/5b4ef1b403fd16a498a9727b863b1044/zimezigasurij.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/95851194071.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/jarazijuz.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160e29d05306e3---fujobudiperowetej.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/47b73b5b174aa3c875215df85c5bb5b5/sesim.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/91343005832.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/8361198984.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/a16f2a906c034335d552fb22b2f3dcbe/gilumukebusavil.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/c0oo4gh853pv5gl3blkirsktq1/97078753372.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/14426922786.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/43067010074.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16087ff0b93d54---jonijifetuso.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/regavetufijo.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/difazox.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f864ddb63---93189774028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+type+a+retrenchment+letterPDF 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_off0000e9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FD 10572 bytes
SHA-256: 8cdd4e62bcbb7c9026a4d3d9d9c2df14a6a11fe8d587ab3639ee0af29d232b50
font_01_sfnt_off000101f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A07 16204 bytes
SHA-256: 2fb5bd980845d2fada05f95ef23133f2e7f595c1e925e65f4dd806767ff7bbf1

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