Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ca170a956ef2e6…

MALICIOUS

PDF

84.6 KB Created: 2021-09-04 02:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: adaff1f8a8a24539b92d62318984d929 SHA-1: 67de73061d6f8b0b289f8ea77376efd5288c6616 SHA-256: 87ca170a956ef2e6b5edd700af25b91bd1e4ab300996fb4f4365a3de21f8fd83
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of a QR code lure further indicates an attempt to trick users into visiting these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://nomylo.ru/uplcv?utm_term=qr+code+generate+pdf PDF link annotation
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/kpk732p4347fnp1a3eminf2on4/3390008434.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/83260ad203a020c9daaece19a87309c2/piropi.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/ev0l8a20lpa95df4hclscr55qf/11560731271.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/dunesujofomabugumigurupez.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/24a057ab22a2386f91bbe966e40c1184/xivonafufarazizosiwamad.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7d343a805---rumapezepolebo.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/e8efa8b1eddca9fe101e21b5fb942f78/48223601299.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/38869706132.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/92570510483.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/norowuvawawebogal.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/35256250652.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a697f6e9a82---24197564401.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/sogat.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/1371106755.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/pagufewirudugalepi.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3aab151a16---32203630634.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b157348e0---xudewefezupifipizazex.pdfIn PDF document text
    • http://crm333.com/documentos/file/42717964387.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/12170192045.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a059d1ef92---kavinutupalegupanir.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/80371029680.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16228159982243.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/75201958173.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/xurudemosegorikur.pdfIn PDF document text
    • https://qnzar.com/files/84883620198.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/bobizukoxuvoxelu.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/zupitivosamilemuwidofoxij.pdfIn PDF document text
    • http://centrons.com/uploaded/file/15630158761040cab3e301.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_off0000e53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53B 10548 bytes
SHA-256: dd0069358a8f043f18500a31093fa818390d294b66814c4fce7ba5268751a093
font_01_sfnt_off0000fd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11552 18676 bytes
SHA-256: 927b7ca526df9482689aa6599ba80e9c70a54689b834a2cc5b59a566c46128cf

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