Malicious PDF — malware analysis report

Static analysis result for SHA-256 9189cd44b4137aa5…

MALICIOUS

PDF

96.3 KB Created: 2021-07-30 01:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 366feab30a85b1d814117f5bbf736d6b SHA-1: ad2e6738ede85516ce911f3fbbb618c7c78c4d55 SHA-256: 9189cd44b4137aa5de5bab5ac24b66658795eb763cc90cf06d271782ef1ba409
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://pixomot.ru/uplcv?utm_term=100+miler+training+plans PDF link annotation
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/862acdc3fee6afc911ef1f39a0832410/50436893716.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/6s79f4b16rbtgfnkk6iam0p4r8/jivezibudasolo.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092e188c645c---siwubafazejebafiraw.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/68480811714.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701ea82528e---vemivilerepideve.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/15694292314.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/virasuxepofusoje.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e10ea74acd8---67332320731.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/88197169248.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/wadotijojonoropododuloluf.pdfIn PDF document text
    • https://mondialardesia.it/file/razojarafosumewak.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/jekepasakuvalileb.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8de63a7094---72558132959.pdfIn PDF document text
    • http://aven.su/userfiles/file/megijusozulodufovafise.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/dujopekali.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/79274506263.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085aa958c70e---42095877027.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/68263061209.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/35615739071.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/gagajodunerewiwifusiletuz.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/7443858717.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/71a5e3affd4918104036d2a31932f854/zogebexutar.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/bbc69a4d08d9ee1a718e43dd3d529890/2354014901.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AE 10552 bytes
SHA-256: 73682dd730c6ebe946d66197b93ba73de5bf0d66a527334fbfb1880720c2dc98
font_01_sfnt_off00012eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146C1 16892 bytes
SHA-256: f9eef4b4026bac8af6d81ac7d21c62f88936ee2f33d6736d59814fde240da0bc

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