Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd91b95b0cae7ebe…

MALICIOUS

PDF

74.3 KB Created: 2021-09-03 03:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44af8b5bdaabcec204032adb7024a8a1 SHA-1: 82b59441bb877f371a2121f31726cece0ee07139 SHA-256: bd91b95b0cae7ebefc15c9498dd9493800edd802e623d26ec194fd60f29ad892
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://aadhaarretail.com/administrator/imagetemp/file/lowudavigewed.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/e6ab436ed8117563ba91e9c117558b64/25250716669.pdf
    • http://photou.cc//ckfinder/userfiles/files/gederedopuweborixubema.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/dvu5rmci7u9418i6ak7em0g24e/supiverazizebonevenotexa.pdf
    • http://irths.com/upload_files/files/5889319812.pdf
    • http://akkoryazilim.com/userfiles/file/33115803504.pdf
    • https://hoongnau.com/upload/files/butonaligaxemajed.pdf
    • https://arerp.kr/data/file///paxijumiforuvava.pdf
    • https://tadimtursu.com/image/files/zuvumurorozipur.pdf
    • http://agisma.ru/files/pages/files/4021556646.pdf
    • http://metisentry.net/ckfinder/userfiles/files/7984907383.pdf
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210526210656.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/vloh2o14iuru9huqj87jual492/61672623238.pdf
    • http://arch-teh.com/pic/userfile/kedumupuw.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/kadimi.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/h49kormg4qq5jhbin5m3h37h31/55871100525.pdf
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/62648583219.pdf
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/9198961387.pdf
    • http://telmeed.com/web/ckfinder/userfiles/files/vupusaxe.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c877c160419---25388530752.pdf
    • http://hgbs.de/userfiles/file/kalinevibuwijozesitepe.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0e6ca61d0---96871548088.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=magic+of+thinking+big+pdf+free+download
    • 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_off0000c0d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D1 16792 bytes
font_01_sfnt_off0000d8e8.bin
676f38a8687f4a24b5e42c2708b5c3a23e52ce37e29dc4b07748a1405dc2a024
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E8 11044 bytes
font_02_sfnt_off0000f231.bin
3abecb29a3725d24cd0e5dded4cd35f1b39611e2214cb5c997c563248c92a062
pdf-font-stream PDF embedded font (sfnt) at offset 0xF231 16076 bytes