Malicious PDF — malware analysis report

Static analysis result for SHA-256 f70b3edf22e8d056…

MALICIOUS

PDF

100.4 KB Created: 2021-07-15 21:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ee0cd83a5ce64373416d1cd74d6062bb SHA-1: 00d589c7b8dbf93ecc774ba975bb7329fea6e89c SHA-256: f70b3edf22e8d0561a2178197408de49b7485e68943435a8ed27ff8b3d19a960
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The document body is heavily obfuscated and unreadable, but the presence of multiple PDF link farm heuristics strongly suggests a malicious intent to lead users to untrusted external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 6

  • 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.
  • 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://dunajecbiala.pl/upload/File/wofenutojavofeti.pdf In PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/10ppf257jgi6mf3mqcvt86fm2r/fibotedixib.pdfIn PDF document text
    • http://nkland.org/userfiles/files/zekizaxed.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f059d1eb98b---21960005827.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b4c3e96bad76feac6a77329ea35d96a/gajeturujelisixujij.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/84521446912.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/59795725480.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/1d6c7c939434433d72fe271dd34daa25/bifurufosejomataz.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/10728984924.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bedcdc7b59e---92842634154.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/er2klg8errh690c3ka2iuug3k8/jeporajowusuk.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160efd4ca86c9b---22290854594.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8790a1812---55325741320.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608004c321c06---97580681583.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b98b6abe018---vefibikepomozabosole.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/75535471602.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/lolujul.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/kabowowa.pdfIn PDF document text
    • https://mtmhomeschool.com/mycms/uploadedimages/editorUploadedImages/file/1702222622.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729bffe2b6e---kaworodu.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608494763b729---bisudezaduvebitat.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61fac7a6bd---lelukavewekekazifol.pdfIn PDF document text
    • https://dineflon.com//files/64792690512.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1fbad3fd0---revopedupifegog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=watch+pride+and+prejudice+online+free+2005PDF 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_off00012500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12500 17344 bytes
SHA-256: 09549745860e2cd8b0be03898bd45d5b3ca1356429f30786e8f37ba51c0e3a07
font_01_sfnt_off0001520c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1520C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A23 11148 bytes
SHA-256: 2cba0ae649bf4df6ef77c8f82e68fe440edf8344af374eb6072473d60c67174d

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