Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52b577973ebf7c3…

MALICIOUS

PDF

84.5 KB Created: 2021-09-13 23:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7c94fe1af603b1bf2692ad0a8b8d1afb SHA-1: af9cc18773f98102e156d58d78e7ee0fd7b0aa52 SHA-256: b52b577973ebf7c3e2cbc4b433695def6b03ef6f66ac5d47f40c95cc3995edc4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and numerous external links, including those hosted on compromised CMS uploads and disposable domains, strongly indicates malicious intent. The ClamAV detection and ML classifier further support this, suggesting the PDF is designed to lure users to malicious sites or potentially download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://archism.ru/uplcv?utm_term=android+atsc+tuner+app PDF link annotation
    • https://dildendilecevirievi.com/upload/ckfinder/files/69574092381.pdfIn PDF document text
    • http://enricobarraco.com/files/74010724973.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/43035213398.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210908164520723.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/20984741165.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/45906039743.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/dejuwakorubipakilo.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/4253af33b628ae935b689f6adae9b3ca/jewobenewexad.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/femov.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/84154871563.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/oj39i7q3nmqhq3nso2mf1us6ec/5071047695.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/73828094013.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/gosorinajare.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/zizetasibalusugexuga.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/wiwidizejatumo.pdfIn PDF document text
    • http://secoinblock.com/upload/files/sifijixof.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/51862526540.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/gipavatoxoj.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/jizesironatozoluzadurixe.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/jesozarezagadudo.pdfIn PDF document text
    • http://dezis.ru/uploads/files/kebopavimejunavin.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/dilomufoduwakid.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/33edf77969edb26a14ee5ed658b6db52/57615826115.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_off0000e716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE716 17456 bytes
SHA-256: 2de7c13cc2707d4766e03cb17788198d7f30f72ed886b89a1ccd6398a9598936
font_01_sfnt_off00011456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11456 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6D 10540 bytes
SHA-256: 177425bf83f93faf0be4d19997091b43caa89efbb3e080e71bd2493eab351bc1