Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7622fed60058ea…

MALICIOUS

PDF

79.9 KB Created: 2021-09-05 09:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: abc6dd98ed55166a5e718c65799337e3 SHA-1: 0869ef8e0f6dc1dc791a87d87bb0d4d8739b2b18 SHA-256: 5b7622fed60058ea1679ad5e041fdc20c5072e4cf75cb9203fe34fbd6eb2b71e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS upload directories, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the PDF structure and numerous external links point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/a1e1e77bf40f2e784cd5f735cd03570a/tojisamus.pdf In PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075419edc2ab---44216271594.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/i4pt4b7pk2oi20o2brjkndfulj/lazolapowisiwobedaso.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/98618500091.pdfIn PDF document text
    • http://sushibelovo.ru/files/kidixapizasemusaguf.pdfIn PDF document text
    • http://thaide.org/userfiles/file/8059292526.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/94419524223.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d633ec374bf---12135640094.pdfIn PDF document text
    • http://abnicum.com/files/file/97830698100.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/88135830387.pdfIn PDF document text
    • http://plncse.hu/php_data/file/16699754932.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/d3117bd71742520d0bca41c76de3a6e6/belatitubesefasorimodaxu.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/wesal.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/56325665606.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a2a080982---78265992209.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/87800524941.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/r04bmkoidf7q7rafmi0vkn97ur/zenukuwapudaliri.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e7a9f695b45---16093862991.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-8-2/20210802030809601542.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/ogle3jd60jq4oq47klt4tr2kc5/52091603472.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afb33380a84---nenuwedazasogeluxixudiva.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/fofalipixewivorosopu.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/munivonir.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10608a4061---vunufirizoxaredivotaneg.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/mapuzalexulixovusefufe.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707dd46e9a6---60616738544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=recetas+de+comida+mexicana+facil+rapida+y+economica+pdfPDF 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_off0000c82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82D 22248 bytes
SHA-256: 15f28b02eff3a88768b8cca59a53367c331a932355a5af899122dbfe8c333503
font_01_sfnt_off0000fff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF9 11040 bytes
SHA-256: 9f766cc4040673980456d689090e39a2dbd6e03fd8b7bd210ddcc54b2d58cbec
font_02_sfnt_off000119ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1