Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4edb7de183d3f2e…

MALICIOUS

PDF

75.9 KB Created: 2021-08-14 13:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: af7c880c68b376188e5e40555e805046 SHA-1: a66cff6977c6121fec06a78e0ff01cad64c8eb82 SHA-256: f4edb7de183d3f2ea1c7881da2f5d5bec3bb0c2346ed19cd5b83d74f8ece3d24
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • 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 http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/teguvopowaponoxizawax.pdf In PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9749996dc---lemewixulodesasefakoxili.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/51a6fbe5bbd2da296eea1a13cc3c9ec3/94497919240.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/fafemunebobaner.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4517fb45b0---43225429043.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/zebujipakowavimaferadi.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-8/20210708191024579996.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/458388605.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/29277804086.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/nexora.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4563454ff---jerekufoga.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/f54fa7b8fd8d968347445a16954f28d5/57983095391.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/56719540749.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/8c1f190083dabf0672023821f95be19b/bofisojufa.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/92482981505.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/noviwebafusa.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff1e9c340e---43834845196.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edef13ebac7---94688813186.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76cd02b02f---takujigazulubobagodatib.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/wozorodasufumamo.pdfIn PDF document text
    • https://papiratisk.cz/soubory/xefolufitomi.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/0330bace37256628411f17b055d61eab/jemenonavaruradet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=charlie+y+la+fabrica+de+chocolate+autor+roald+dahlPDF 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_off0000c66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7C 17812 bytes
SHA-256: c9beaa8da891b7a7445d95f7e9d73f497ab555bc9ac037b8ec68a3da457bc7e2
font_02_sfnt_off00010abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABD 10684 bytes
SHA-256: 3bbbb90d0914536e2f593b1ce1b4e46d8f75f34e1070b566041616049fe1d671