Malicious PDF — malware analysis report

Static analysis result for SHA-256 989a527b64bc15b3…

MALICIOUS

PDF

85.0 KB Created: 2021-09-17 20:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 93764c45b6a484306a595b17c477d150 SHA-1: a4ae00d7e8fecd7a9db895a91d4a291d51804041 SHA-256: 989a527b64bc15b3854c9085d882846c66e313afc5df8270f3e776c97aeba54b
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://shipnhanh247.vn/asset/files/84077703251.pdf In PDF document text
    • http://tehla.eu/userfiles/file/vorowiwe.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/94b89ca346dba57d23ee45bf6a5f1b5b/nusirosimajig.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/mopiwejifenevire.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/lajoxamaluxale.pdfIn PDF document text
    • https://olivermilk.com/tctt/sites/aaa/file/10322374847.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/63170704440.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/63223601269.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/40666267526.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/868471855.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/vorezifibofumabowo.pdfIn PDF document text
    • http://mamadona.ru/ckfinder/userfiles/files/jofij.pdfIn PDF document text
    • http://0048.pl/48files/file/64897178875.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/68543913505.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a3fb30b1e---rogibizasegalagetazax.pdfIn PDF document text
    • http://dezis.ru/uploads/files/dipozalukebim.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/pofodemokazif.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/vajimodagadapix.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/24258185696.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2b97e2b39---kazokevezefekedefasadave.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b4f43b9ef---lozumaberimotewowejiw.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210909021349.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=76+impossible+quizPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/25821273897.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_off0000e785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE785 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF97 18472 bytes
SHA-256: 413bee28b4def9760a510653d351fee02c692837ffdf70b5c0e43a8132670353
font_02_sfnt_off00012f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F51 10516 bytes
SHA-256: 50fa40a787ea46f8536c0d397173aa805193b2844556aed6b92154e333454491