Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e5559e7b2b9b64f…

MALICIOUS

PDF

74.8 KB Created: 2021-09-19 17:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 77e470de665e8bcc1855eb10bf30351f SHA-1: 4d3648046b39353f2eeb40fcb67c4dd172136cad SHA-256: 9e5559e7b2b9b64f33e9dc9862f94f0c63f525ef5cc20d6d2f2f6e4abec1a423
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The presence of external URI heuristics and link farm indicators further reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pusancard.com/userData/board/file/pinunamemotofagelikipux.pdf In PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/gevigesedawelotijekov.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/tetef.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/96518566857.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/34539969368.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/xedusufitutakiraxazoreb.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/77890517464.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/goreni.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161412153841db---fides.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/33266116259.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///fiwozitawamuxug.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/58287988547.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/39335098952.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614098ecb8d67---zixod.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/73730705830.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146635f2f336---rowozevufabiwik.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f6fcde906---lugigukexofara.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210912025029.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/nusufidalilunusowari.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/85124163670.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16136909eb9d95---60431704233.pdfIn PDF document text
    • https://icbacademy.com/upload/files/54853863940.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/70810542052.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/xutarefor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=scribblenauts+ds+romPDF 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_off0000c018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82A 16912 bytes
SHA-256: a7f7434f2ef5abba83f8044d72b59ed1011d624b47edade0ef80576785216a86
font_02_sfnt_off00010383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10383 10844 bytes
SHA-256: d30eb56d3fb6f58d4a08f227d0278d1f7e045588ad96f4b1fe83e2ac9e80583a