Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cbf645ca7775b25…

MALICIOUS

PDF

83.1 KB Created: 2021-07-03 16:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6f5f9e419e4912e1d001e7bb1171f877 SHA-1: 52f6be431f0f68e395a08ecf3f23952f8a90022a SHA-256: 5cbf645ca7775b2507d944d08c9b763e20fdf04f2c75987a582498ec0cedded9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and an ML classifier also flagged it as malicious. The primary goal appears to be directing users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://emmaushuis.org/pages/57413749939.pdf In PDF document text
    • http://bortran.com/upload/image/file/20210601062158.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160755ffb89e68---pewupakejofu.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/zodekukilux.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ffec5711a---mamuvepovavitebujuravi.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/dexuwuduronakib.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a06cee229ea---39688205057.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/76a3c9f83c98eef78f423d09a039c04e/pumitoxu.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/52820849062.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/d16d05795472a39a9c032570fe99d8bb/xajanapi.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607118c3d4337---55071174941.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/2907734249ba069ca87110e27aaec4cc/pudisupe.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/7034858334.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/0kk9184r4ljc6og2i70a0945m4/vamedejezanifijiwolisexo.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/92423759982.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/5f11e63d49fa578de24a8019299a5004/lejobakevujekevid.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/51353422860.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/ac2583iomg03mc2qi38t5ncgv7/sowib.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cedf981ac---wejozivunewozuli.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/57762746523.pdfIn PDF document text
    • http://fedime.org/imagenes/woruzimijawalazav.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/79013139754.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/mizojogulovitifoxojatij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=family+first+cremationPDF 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_off0000e38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38F 10588 bytes
SHA-256: 63bc1bff8467fd4e733a6f3033eb33d8f4a1e19278bbd87b7363069df436ea67
font_01_sfnt_off0000fbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB6 16784 bytes
SHA-256: 717ec770a2334d33ad8079c7bbe6e13093b28ad59a3fd79bc403571158da49b2
font_02_sfnt_off0001276a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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