Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca09a1240a320c98…

MALICIOUS

PDF

86.8 KB Created: 2021-09-04 06:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 55eb3f13312cca5efd1376a645ba9ab3 SHA-1: a24806f37b8b1a5b448ffe797057437abcaa6e94 SHA-256: ca09a1240a320c98ce3e0e01fe654912b86d846b3918a9e54a05c4ec99e1320d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload storage and disposable hosting, indicating an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://supermagnum-bg.com/ckfinder/userfiles/files/dotudizuposafajilureru.pdf In PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/xarotojawedabonaderiv.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/xesikaligufanepewin.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/56309771614.pdfIn PDF document text
    • https://sanidom.pl/img/file/25960836979.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/nusavejerewerenomefogise.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f88ff648ba---mimapominabozetupitagum.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/dimolivutumip.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/judatememegepanezawaxula.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/8aae64e8d83614f93ea0166b8783f181/55601199623.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/kidubud.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/16348746715.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/nanexumoniroditulosaluxe.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16119f098b7db2---mimonugovowonapunupabo.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/s85qj2nc5f701m95jgm2k8aka8/jaloruvi.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/kafirofe.pdfIn PDF document text
    • http://195exim.com/datas/files/30612693866.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/30posi0qbm4s460mnr9a9tar20/11008759618.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/938cb8d06cf00a4719fb45783e931322/zitezufatoxoxozakop.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b14cc0aea---dapodikibototetezojo.pdfIn PDF document text
    • http://dymenahealthcare.com//upload/fckeditor/file/15250688651.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/biwife.pdfIn PDF document text
    • http://didopack.com/files/mavubuwadawatezidak.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a77b71649ec---69222818117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=gateo+definicion+pdfPDF link annotation
    • 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_off0000ecb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB9 10336 bytes
SHA-256: 3dcfcba23a110666c8008a3cc649ae642bb3793c1194eafa0b0f787b11aaceb0
font_01_sfnt_off00010430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10430 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C42 18240 bytes
SHA-256: df4d66ff9ca9d21f059265bbcdb930238b04f84119257a9e09a244c802134639