Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22f4de658fb5742…

MALICIOUS

PDF

79.0 KB Created: 2021-09-04 23:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d57f4e8fde3bb82be0fce0732d574d5a SHA-1: 35786cb01d4e6d122648f8249615f9bc4d2ec632 SHA-256: a22f4de658fb574221ad94b403560a9fd74e4d3f5328345af195cec3a0c6daad
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript actions. It also features numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The presence of JavaScript suggests an attempt to execute code, likely to download further payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe7e94895d---nunutifupodexu.pdf In PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/9b0c500391523235f15941f912428c2b/kazepeti.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/41764116945.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/314950269.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/85865416701.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aefd430b9a---23784741439.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/53190536844.pdfIn PDF document text
    • http://capital96.com/userfiles/file/kexep.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/jarutisigowomusadekibe.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/52e68f16587a2a6de53571140e3cdac6/buxozugeridikazekususa.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097b03373567---43757107271.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/9483215458.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/6950907395.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c76f70a517---woxerogikamevadiwebizuz.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/45323960159.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/mowiteweminezomokibakap.pdfIn PDF document text
    • http://anadarkogomezfamily.com/clients/7/76/76920377ef4e0cfe2c6e77079a05cbd4/File/divowidixazuluvolif.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/tonari.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/33144922551.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/96870966591.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/2pb2t6i6p0hl0p46bqs6238hg0/97704129498.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608324481a59a---34064475385.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/visi1d2ct443094fgf6df9jsg3/nugokopilepula.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/12958518655.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/i1kiqb3t8up6gh89uca0ro1l86/fubax.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/49220174755.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/japoregazaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=tratamiento+epilepsia+infantil+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a1c93f13a9---71616762095.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_off0000cec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC4 10624 bytes
SHA-256: a1be5269110b4869d36af4dc83c1c5db6070851d2fc927ec2969123bd2484857
font_01_sfnt_off0000e707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE707 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF19 18456 bytes
SHA-256: ee6ae31a39deb77841b9a80712c072be858e8a4fbd4d2d2f243646d9526e3f22