Malicious PDF — malware analysis report

Static analysis result for SHA-256 555b7d8207a07829…

MALICIOUS

PDF

77.9 KB Created: 2021-09-06 08:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b17d3d1f8caad0ae4deaf47942679367 SHA-1: d08882fb869e4a13d4d6e62b1cbb1c1a46adefbc SHA-256: 555b7d8207a078290400ada8b60da716be38331672578344ba2c648e4deb7a50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised WordPress sites, which in turn host other PDF files. This structure suggests a link farm designed to distribute malicious content or facilitate phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://catamma.ru/uplcv?utm_term=nuance+power+pdf+batch+converter PDF link annotation
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921ff781d42---punexusiled.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/pexudegamanaxuzotog.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e66edccb65---23936231125.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vekefufinus.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/6a91825e9613769589955e12df73259f/94371681707.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/niwofesix.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/62390998481.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/kativ.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/1b4dflt09n8q7llrhselkov530/12662022802.pdfIn PDF document text
    • http://www.moyekolodin.com/files/fiduzoxofoxeboromenoza.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/sojewusibom.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/wobevafajabaw.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/1651hhmugrcli1rkh1g5us5j05/20454512256.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad950f11310---9588055009.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609890e68f86f---85750046088.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/sezumawa.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609458d77749d---35716489422.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/503ed53467e0ff42a8768d1abd55bcb6/96207772104.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/pakuvavisudamosig.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/87823613814.pdfIn PDF document text
    • http://safarang.com/basefile/files/31450307025.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/1f8181ae8139865adb6a99787d780989/rigorazoraxanipadan.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/m21roo58lqctv690bhpof0bb84/71070986775.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_off0000ce41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE41 16540 bytes
SHA-256: 235c23f60474f369d236ace916ae84080016ec993345800715efb6897e4f537f
font_01_sfnt_off0000f8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F5 10780 bytes
SHA-256: 2d87c773e7e7d880eeec4dfca86193c2e7216a3be3b3c7d9702970e3314a3d06

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