Malicious PDF — malware analysis report

Static analysis result for SHA-256 384b022a8d8c7c96…

MALICIOUS

PDF

82.6 KB Created: 2021-09-19 23:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a4d5c56a5def843a9ed5e23bd4141bb0 SHA-1: 7084bb29990adab07c6a68ae71a4462608575714 SHA-256: 384b022a8d8c7c96a66671cd47752154a6bf2706a6a00ed7ae14e216d2b23ce9
216 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it contains a link farm pointing to compromised WordPress uploads and disposable hosting, and a direct link to an IP address, all serving as lures for malicious PDFs. The 'SE_PAYMENT_REDIRECT_LURE' heuristic strongly suggests the document's content is designed to trick users into believing there are new or changed payment instructions, a common tactic in business email compromise attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://smartdeal.pl/files/upload/files/pobulamomimezov.pdf In PDF document text
    • http://thebankcardservices.com/uploads/files/dibogem.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/biwom.pdfIn PDF document text
    • http://falcon.dk/sites/default/files/webfm/25549206625.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/024cbe0b8878126d3b08cd8909dcd91d/vevobiwitomewegorug.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614615e325eaa---72165291053.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/fewakogasaxasekanegevare.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/jarajerederux.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16134ddc717f6c---45954031119.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/mikiretasi.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/tataliwuwokagarunodimuw.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/nasipug.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/55362879992.pdfIn PDF document text
    • https://businesslife.com/content/files/7338055571.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/buluzaraxabinikifisezizex.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/31033175261.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/wiwitewukux.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/161324b009e8dc---36512238135.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6ab49c8ed---62602013281.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/jamapivubanekipas.pdfPDF link annotation
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/vukebixeselesox.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/72634255263.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/zigosutodabaradewof.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/41452967789.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/goxetamavopilepibotata.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/31275609685.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/sozobapugikulagututo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+use+nova+launcher+to+hide+appsPDF 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_off0000ddbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D2 10852 bytes
SHA-256: a85e74df34ebdc63b2573136edc9451fd26407b92f17b6b1da22040efbbd723b
font_02_sfnt_off00010ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED8 17300 bytes
SHA-256: d13d156e7e71ef765ed3ea747964fa382bfcd834ad7b6e2b4df65f17d7bab809