Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d54d3457d25d847…

MALICIOUS

PDF

97.0 KB Created: 2021-06-29 22:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1105860016bbc2e9f1538f50e856260 SHA-1: 3880c56f9ac4c6ecf3f9cba8f138ffc3d19bdab9 SHA-256: 2d54d3457d25d847c6c0e8d7310455baab2af593094b0e5559ee6add57a6121e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to other PDFs hosted on compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm and the presence of embedded URLs point towards a phishing or credential harvesting attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/runracpurpv50iu2g52rf87toi/judotasa.pdf
    • https://psfund.org/public/uploads/files/cms_files/xikovijabixeg.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/v74qr66dp0s80nlbinp7aror6h/rufonofijiwumigumolewawo.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c59fe77e140---99360637032.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fbf2932f2---1855141524.pdf
    • http://mwflower.com/upimagesfile///91231501974.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16082c18e207c8---niweg.pdf
    • http://scandirent-new.ru/uploads/assets/file/48150327750.pdf
    • https://remoteyourstaff.com/calisma2/files/uploads/zelilaridivowena.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a280347d93---wupalufedibabogiwuluwon.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/ujrkv2lfvteggnqcn0g974m0rg/99105598006.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608746da68aee---57322661473.pdf
    • http://kardelendalgicpompa.com/uploadfiles/file/revowa.pdf
    • http://bukhatirhomes.com/userfiles/file/visasoxugumiruriweda.pdf
    • http://xn--2-140-swe8h.xn--p1ai/files/69779613020.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/3c82e206308808b2403593980b86696f/46910518252.pdf
    • https://blogsma.com/files/mavamaxitipejusopikufaki.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/16ae021ea19ad32177d3db856491215f/69937604883.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/r3dp99oiv630d5ilc8uu0fap0q/wamaviwufoxagonu.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c61260fb39---naxugor.pdf
    • http://teplospectr.ru/images/files/vakufejadi.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/b4c4085c0264c0d8e643d897578181a8/deropipanapusone.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/f4b2e28015d5c0d9a191b42cfde3b920/zixidilajuguniw.pdf
    • http://hbleg.com/admin/userfiles/files/68694810226.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4093f970d8---9105151155.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=lectura+pdf+android
    • 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_off00011504.bin
967103881a7a3ac6e7253e499d91963ebcfa84992ae4b4f5846d3d6712676668
pdf-font-stream PDF embedded font (sfnt) at offset 0x11504 18664 bytes
font_01_sfnt_off0001456a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1456A 16792 bytes
font_02_sfnt_off00015d81.bin
16d9308a90deb86ea5f43e7951679af8f85ac6fe7d8a7adc68da307bfeee196a
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D81 10456 bytes