Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b222be02f67ac32…

MALICIOUS

PDF

136.0 KB Created: 2021-06-26 19:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd1acc99f8a331d2d620b36807b76f7d SHA-1: 9254a285f6f07aaf5e15dc57a19025634654307e SHA-256: 5b222be02f67ac32e8192050cf1075fe4232fa1471fac5ddee6b01031ad6863c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://aylincinarli.com/fckfiles/file/guzegepoxuja.pdf
    • http://lideparts.com/userfiles/file/1622421042.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34cace57ad---luwadife.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160864eb076eb1---detizijibirodotuvujajixik.pdf
    • http://brmxn.com/userfiles/file/20210518045142_ilsvl8.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160abcd6c45dab---58128398097.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ee184f439---kalemedudisusufidawekufe.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/9b18b6b9efac1474aef8ac77ad9ce1ea/mukexepok.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/u21kfp6bd90d31pck410spk002/gugakulupuregiw.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38462db7fa---84888031296.pdf
    • https://dannysacademy.com/ckfinder/userfiles/files/gatikunuragiva.pdf
    • http://orchid-daikanyama.com/userfiles/file/zotovoserewidajefov.pdf
    • http://pensjonatagat.pl/userfiles/file/38908864215.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/equ2shmi3h9sn7l6lghedoes7m/49854120455.pdf
    • http://mmbc.cz/_data/user_files/file/xelivobawepetefim.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/cbdfr86ek0p6cjvknb66tjdlv0/5569609941.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/dagewefajanalidena.pdf
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/8428183889.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0fc363da5---83313334501.pdf
    • https://aawyx.com/sites/default/imageuser/file/61773905900.pdf
    • https://alakharia.com/public_html/userfiles/file/78101090000.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b64140cdc61---sifovaxaw.pdf
    • https://peilimineko.com/userfiles/file/62079520017.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/1a061d86bef98319e82c20c9529e3b63/63221899845.pdf
    • http://cuacongtrinh.vn/upload/files/pozexigekinegedil.pdf
    • http://pwmtqatar.net/userfiles/file/46769662018.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=timex+rss+210+user+manual
    • 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_off0001ae99.bin
a4040c01052b8df1c4332f5e7811ebbf64dc1be7f871773f11caa012d8b9576c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE99 19552 bytes
font_01_sfnt_off0001e0cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E0CC 16792 bytes
font_02_sfnt_off0001f8e3.bin
ebe1a486ee0fa9126e602d669b14d05511528a1102a12c09f428647ae26d525f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F8E3 10512 bytes