Malicious PDF — malware analysis report

Static analysis result for SHA-256 b90d453fde040512…

MALICIOUS

PDF

99.7 KB Created: 2021-09-03 17:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 55eb49891418208ee24c8c7f91acd419 SHA-1: f6327f4cf0553e4078941e0dd50be096f9ea3e33 SHA-256: b90d453fde0405125dcd5f70d8a9adf787463e86b5eb1bb0b08d100af3c57560
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of external URIs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/9b8bd7843ec14fb6c3b574ccc9158c73/96200222295.pdf In PDF document text
    • https://alixdemassy.fr/userfiles/file/72506681774.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/wokinusekusiborekur.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caba9cbaf1f---medijaruvajetugelisiwovi.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/88364997918.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/negiguvezosobo.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/24243510143.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/visuxujikojixikofudiro.pdfIn PDF document text
    • https://baongochoa.com/upload/file/lonobu.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/e29d9194098a35bc403bcbf65d1550a1/37619200956.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6768505a1---95891123092.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16105e3671a149---88108950357.pdfIn PDF document text
    • http://domosplast.hu/files/file/setijepezajuguxefodani.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/wazewojutexuzuvijakifoxad.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/i56pl764tip2j613h2j13ib6dl/zuzuwidusodavixojidona.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/sobapaduxab.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/83860149439.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a40f32ff3---27767759452.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/wozowapipilawa.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860b5d2bc4d---kusogiruwiwitug.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/4345659369.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/78556553415.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/busefinit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=recueil+de+poeme+pdfPDF 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_off000115f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F5 10292 bytes
SHA-256: 5710d80cc8f667835287a8c8c9ff77f85fdb22dd3b6081c106d6206acde0d0ed
font_01_sfnt_off00012d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14524 24164 bytes
SHA-256: a84b53d28f3b6b451da6666bcdea2313470803b5733d19dcfcbc1b444c978dde

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