Malicious PDF — malware analysis report

Static analysis result for SHA-256 276f70b4bd62f546…

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 20:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aff6fbd90b5d7054b1fe544a4cdca0d4 SHA-1: 8c396fe73cc97153925ff1972fcec00bf530653f SHA-256: 276f70b4bd62f5460baa17cfa790ed7dbb83728127a00d509c47c7bd994c5f6f
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 storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://chcial.ru/uplcv?utm_term=pc+controller+for+android
    • http://arniestribu.com/campannas/file/47594844465.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130385e3d35f---virekuxi.pdf
    • http://golfvillageonline.com/userfiles/file/67350283959.pdf
    • http://daydreamspin.com/userfiles/file/bumudaxoparazilawepas.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d9498c04b---8948319542.pdf
    • https://travelinnsuites.com/nbloom/fckuploads/file/54489758149.pdf
    • http://sten.kr/club/data/userfiles/file/20210910125932.pdf
    • http://collegium-connect.nl/ckupload/files/30200515982.pdf
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/gajusurujinipavu.pdf
    • http://mim2010.ru/userfiles/file/35059355139.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138474077374---74475391635.pdf
    • http://tw-sincere.com/upfiles/editor/files/xodedadebub.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5014036c2---nerekuteresoxusedi.pdf
    • http://secondhandgraphics.com/usrfiles/file/refebufebaduzapib.pdf
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/bebefikupuv.pdf
    • http://boldogelet.hu/media/96452092202.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcc4098eb2---fajosinarazajabo.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/98394675991.pdf
    • https://premium-house.uz/images/file/41790098227.pdf
    • https://afritransport.com/app/webroot/files/file/karovujubuwokolibijipu.pdf
    • http://hondatayho.vn/images/ckeditor/files/66421321264.pdf
    • http://xmzhj.com/UserFiles/file/5280008513.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6b65ac2d8---82488481012.pdf
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/4449545003.pdf
    • https://recapress.com/ckfinder/userfiles/files/99345617540.pdf
    • https://phukienbep.net/media/files/dukotigopom.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dba9.bin
8fe2c7068dd9ed8b7ac01f82c20ead5d260e7ad0260b1202b6b2d0eb80aaefe2
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA9 10304 bytes
font_01_sfnt_off0000f2f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F7 16792 bytes
font_02_sfnt_off00010b09.bin
15cb76fdbc5e51c0e3463e2233867c0f7a9a48c83afefa3e1499004de2ae02b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B09 17628 bytes