Malicious PDF — malware analysis report

Static analysis result for SHA-256 97365d77ac56df99…

MALICIOUS

PDF

72.3 KB Created: 2021-06-26 06:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36e6730432d1d2d669246451b9ab86dc SHA-1: 4f797d820d318f4b834a7ff62f72fc68106089f4 SHA-256: 97365d77ac56df99ba30a74e052dbd8435b54ab75e2f421fb9338d305f576d25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the presence of external URIs and compromised CMS upload links points to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://crysiq.ru/uplcv?utm_term=in+ac+voltage+regulator+triacs+cannot+be+used+for
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/15813ef3878de209dc11f5e1d796de91/2959808233.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16074167b241e0---42754823882.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/5b9a0a63dc6f85347fe788483b3d7820/82173039684.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c60d73d0b1d---vifiv.pdf
    • http://clair-environnement.eu/catalogue_dynamique/file/46353108258.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b41642a09fe---webuwexekilumokisasojifan.pdf
    • http://sattosushi.com/uploads/files/10305128228.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86d9a9ac28---zikopufudukonowe.pdf
    • http://aquatrustfina.com/userfiles/file/vivodejolabonut.pdf
    • https://allmassage.net/upload/file/20210605073348.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/fd9e2b70eedee4e351a3c7fd5a697d65/xowijuzodawu.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb118473315---vabepebire.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/59393dcaba538fc6b71e89d780110f7a/jegogunu.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6a5c811f2---laborenolugeteb.pdf
    • https://soechi.id/userfiles/file/jirus.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/b36c59a56392ee34a05bb2f18b3954c5/wonanudorovetep.pdf
    • http://azizolace.cz/images/file/finasazelagiretalijed.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/o07q5e01obutrp7i7d6vlurb37/mufudenisiwexidulodaladaj.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607f80bbcd5db---8782521614.pdf
    • http://jrpst.pl/userfiles/file/jalele.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8b33251b3---berokamofilamokeli.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609dafbfc65de---31996765573.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607603c687956---64663705534.pdf
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/tigixijaniduxeruzunirobo.pdf
    • http://beijinghuojia.cn/userfiles/file/14571494119.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_off0000ba0c.bin
b93d457e167803dc8e1500aab18e805fd188775622caa585b78b9e0ed0e6c814
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0C 15080 bytes
font_01_sfnt_off0000e076.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE076 16792 bytes
font_02_sfnt_off0000f88d.bin
c126436a0f3d33d2edfa482a6c69f76caefe82e2d19125a6a963c36f99bfa2f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF88D 10908 bytes