Malicious PDF — malware analysis report

Static analysis result for SHA-256 46176badeed7f96e…

MALICIOUS

PDF

73.5 KB Created: 2021-09-16 14:37:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 152886424e11bd6f6238e2c59b27ebc8 SHA-1: 468139876c2cbaa949de42731dfbba32e8cf89d4 SHA-256: 46176badeed7f96e8fe02650d517eafc75bcfabb81e20ccd29a00bb941db0ff3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.nhabe.com.vn/ckfinder/userfiles/files/tuzepup.pdf In PDF document text
    • http://hangtatmj.com/userfiles/tadokamunovugixigenibusa.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/fizudukuletegob.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/ginesize.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/97218600305.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210905183119_yx1fg8.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/44535865786.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/55620608420.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/makiju.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7beb93b42---domagasab.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be755ae3c9---32307109611.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/68703679263.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/sexemewerevavadotezum.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/55071767901.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/zuxezepadukep.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/tamus.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/mixetekexijabexanareduzax.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137e26053fe7---menegelofixajuxusupadeda.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/41367751941.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/92548858713.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/liwokoguladujobibepod.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161355c0626477---nowuji.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/kuxepomitunibipure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=download+subway+princess+mod+apkPDF 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_off0000bcbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D6 11112 bytes
SHA-256: bc1a5bbabbb58ae1c29fa0c18801ffd44a1cf9956c98a85c60bf296cc7ce06df
font_02_sfnt_off0000ee8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8B 16544 bytes
SHA-256: a6d37c723dc878d9240c730bd7a6ffcea85dd86f8fca7b19701b5d467c8725dc