Malicious PDF — malware analysis report

Static analysis result for SHA-256 72503efc665ddf49…

MALICIOUS

PDF

74.9 KB Created: 2021-07-05 12:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68dd2e27f167469bfce1d94ed51fed29 SHA-1: ef59f81a48d23d079d0d3e8cc04abc9376112621 SHA-256: 72503efc665ddf49eb628ec3eb1a0fd82038a43118693252f05c652dd4413573
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing to numerous external URLs, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609081d149f7f---kiduvomiwiwuza.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/ulhtqgtjje1tpboi60nifdcmh2/nabuwikepivokovupagefa.pdf
    • https://aspirans.com/files/file/xuned.pdf
    • http://lacasedescaraibes.fr/file/gunovetuvuloraj.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6d0c29c49---6826387369.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2533b0892e---73443434748.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098d7c599975---vuxalopi.pdf
    • http://hasici-pristroje-eshop.cz/files/file/vitibolokafojajebekuzalu.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/p37hk2m1ktioov9p9tk4r1khan/sezemim.pdf
    • http://barbusci.it/maisUserFile/file/97498472961.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/2106065b0ac7e3e40241e3f8fafe05af/9612283163.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/0aa92ca601987b33216b9c1f6dd283c4/83935086606.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/j706pfd8f7rd9qndcio93timg4/46761611425.pdf
    • http://k-souz.com/userfiles/file/60212803756.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bfd890cae---karajibirazexozop.pdf
    • http://nedirajtebosnu.net/userfiles/file/bilukozilamasunufi.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/oe1pgivgp6psnkm0fm19dkk131/62757738370.pdf
    • http://freeski.hu/freeski/file/gokabezodilutitofolobem.pdf
    • http://csc0532.com/userfiles/file/20210618154223_zk1jgg.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/19d3j3cnu0le95rj2gptufmb6e/84099022010.pdf
    • https://szud94.hu/img/sajatfile/files/14039201250.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/73a8c2dd0a9e2ffacc4d68c403a9ab41/3501325081.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/sdnk4ro3v6cm9inhp64uilh9tn/59028116058.pdf
    • https://xn--faade-zra.ch/ckfinder/userfiles/files/24375075710.pdf
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/dopojavakitudodijawuf.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=introduction+to+r+programming+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_off0000c4f7.bin
685d82194f84073bd20892139e4355ae6371900ee308f0701d6bbd320ba8e095
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F7 10668 bytes
font_01_sfnt_off0000dd2a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2A 16792 bytes
font_02_sfnt_off0000f53c.bin
31d557f935fa78e751ea52faa9ff1acb92eacc7c73b989047c3676583e00ac2b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF53C 16040 bytes