Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a62c3f2e4f068ed…

MALICIOUS

PDF

77.7 KB Created: 2021-09-20 22:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 23b3262b64afc61aaa580841f97e0fdd SHA-1: f6ee953f88829eae78c4e3f59cf5235a5ba7f92e SHA-256: 0a62c3f2e4f068edd1c133a92c315a6af19b975bcd0b05258a20e7103a7955c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://inwebjor.ru/uplcv?utm_term=avenza+maps+android PDF link annotation
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/50htb7t304tpbtanrbru30920v/20933358915.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/49224452726.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/melonokakufiwojabigakes.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/lematozedafuv.pdfIn PDF document text
    • http://khmim.com/ckfinder/userfiles/files/45207033678.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/5820006c5331b129933e453ca47684cf/kikow.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/11719560349.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/60607236070.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/55211890480.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/41766665397.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/88695744012.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/ralelev.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/bozog.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/82640766854.pdfIn PDF document text
    • http://hkalc.com/userfiles/nadute.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/34399572281.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/julezazujekuxiguxomuf.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/84527357360.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/10775953912.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/fomewomosiradamo.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/83165040867.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/69733110777.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/3daff9a823685d0e14f2d9cd4396aabb/49941273468.pdfIn PDF document text
    • 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_off0000c937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC937 18788 bytes
SHA-256: 69cfdb3b5ed3f9db476ad229d1203c37fb3533e52bf754254113227c95b4cd77
font_01_sfnt_off0000f9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B3 10516 bytes
SHA-256: f07de6eff2f0d81366b18245d4471321a52276dfae61a15b5056d210b5224443
font_02_sfnt_off000111a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1