Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bdb2ea95d43e22f…

MALICIOUS

PDF

86.8 KB Created: 2021-07-16 06:38:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ac7bf57d08775cef49fdee2959be51e8 SHA-1: ac8f66d1fa8a82dbd79ffedb1b22c6056dee5ec0 SHA-256: 1bdb2ea95d43e22f292761712d2d1068b879b003f6fd38f46c43741841bc3424
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of multiple PDF link farm heuristics indicates a deliberate effort to obscure the final destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://staractivecollection.com/resimler/site/files/nokuvofezawuketimut.pdf In PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/patunaketemu.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/18d488d15ca7d0db37eb83f556dbcbc2/juzatijizolimemedarako.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/robolome.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/87697862970.pdfIn PDF document text
    • https://premiumtrade.ro/ckfinder/userfiles/files/pelukasufuzen.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/pukopomomomabigipipiti.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/p8jeop0ofkgbrue1vsc7a20mp6/witafepakub.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/26b48a96e500548170c9aa8331942c78/vujulupexovexutadewi.pdfIn PDF document text
    • https://faceless.me/userfiles/files/pamedawi.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/42889202278.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d35f23d2c9---sagit.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/40841037941.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/15833321809.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/rutofekopaw.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/85590003944.pdfIn PDF document text
    • https://sayurmateng.com/contents//files/vusowixojewoliwaxofate.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/59408282989.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/61024290113.pdfIn PDF document text
    • https://superpart.com/files/70594380544.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/d3fdape8h6l5d372cgq9f39g73/pizebo.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace041d51b3---94054973670.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9209f08ad---lekusij.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/o3ak4gmks55tgpmmiph5cnao44/baresarinevofinukorijavar.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae034f0705f---51785066013.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d7932ec81---65433409063.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/fexumowibegorapatikadisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=pdfelement+download+freePDF 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_off0000f175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF175 17228 bytes
SHA-256: ab2393e278d71fefd93279b78ffcf72b20497c3b7570839cfa3abb8c11929f1f
font_01_sfnt_off00011e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E81 10344 bytes
SHA-256: aaeeb8c9e2f83368618c4bca124424a25a16f50b050518102deb0ce237029d33
font_02_sfnt_off000135eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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