Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3df2f5d8b53292…

MALICIOUS

PDF

83.1 KB Created: 2021-09-14 01:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: afee20645ec45393697b1b45ace2f4a2 SHA-1: c82bcbb04db76182689ec3c39f5c4b402b770c70 SHA-256: bf3df2f5d8b532928ec476f3371516b64867037c2337b3418585f3bc104e18f1
172 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=bullet+force+mod+apk+unlimited+money+and+gold PDF link annotation
    • http://keletunderground.hu/images/uploaded_pics/file/36453470449.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/18021362822.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-08/images/files/zupiruke.pdfIn PDF document text
    • http://dalaichau.com/files/69400307590.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/fb5ec86db727ec230a24c59b02556e0a/36071088590.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/wakuvazuxo.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210908142904.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/zekep.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/i6n3pp14ucbh6v28j0h2geco0d/32066619490.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/18335126894.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161316d4fe32a5---lotulasosig.pdfIn PDF document text
    • https://ayurmitra.com/files/file/gedabizagatojopewejolar.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/fudale.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/bulefalazobidasi.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/43529668958.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/20045571902.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9a2a9c6deb3b2f4cd796a4fece61ecac/939077006.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/69943488233.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210914070352.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/1182049520.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/29001988846.pdfIn PDF document text
    • http://kaies.cn/upfiles/2109092001232805649ndwi5.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD49 11156 bytes
SHA-256: fcb0a15f36b2f5882956d68f1d514f8d81064f3196aeffccd556f579e74de2b8
font_01_sfnt_off0000f738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4A 18160 bytes
SHA-256: eafe815170ff820f2b4b6f4308f15f34d651eb5b8828cf45c05b44fd70da6e09

Open this report in the interactive analyzer, or submit your own file for analysis.