Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b6889c03bb4b1a…

MALICIOUS

PDF

68.9 KB Created: 2021-09-19 11:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 149b373c8521d880cedb2e5cae602e51 SHA-1: 77f705a13e1d7cd519fe9fa7f33cea84e2aaa719 SHA-256: c4b6889c03bb4b1a304652a5bea7e6b586cce276fa3d9995fcc6c035cece4273
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to other PDF files, suggesting it functions as a link farm. Several heuristics indicate these links are hosted on compromised CMS uploads or disposable hosting, and one URL includes a 'utm_term' parameter often used in phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=god+of+arena+mod+apk PDF link annotation
    • http://xedaptheduc.net/app/webroot/uploads/files/nopusogofa.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/67720911964.pdfIn PDF document text
    • https://tessuno.com/upload/files/613ad81310a2d.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/fogegekipimonavakujimi.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/61853189431.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/validumamopononim.pdfIn PDF document text
    • http://ortosprendimai.lt/userfiles/file/vojasumazuvakureweveza.pdfIn PDF document text
    • https://drgcode.managenet.ro/images/file/gakaguzaseketugobimu.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/48317977528.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/c3fiirtd8aonmvonlf5k8hmgo0/ludoxijiditevixuviniwik.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/32519702658.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/45251401724.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/bitefadezumuxozulume.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/54234871944.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/naxujiru.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/kolosesovimetomufixux.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df7002cbf1---38781633002.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/nukudibijekiwujinige.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/29028795869.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/vogugejo.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9075a1ab0---8118670111.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/fefawazutanasemedasigujex.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e9c38a5a3---varukisufoluligurejuk.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/poxalonodurozoxu.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_off0000b0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DE 10384 bytes
SHA-256: 4392da6f0a9d4159ca538d4d7f2513c4caf01ab0ac05de9197ba7b693f2fc22f
font_01_sfnt_off0000c855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC855 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE067 15120 bytes
SHA-256: 2155b389648e7cbeffc6be0395e6628ba27897be43131c31d8c18ed6a3b52f32