Malicious PDF — malware analysis report

Static analysis result for SHA-256 d249c8e4a63962b0…

MALICIOUS

PDF

84.5 KB Created: 2021-09-07 16:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 686aa9f8ac81bf0b9b16dc95b88b0a3f SHA-1: c2760c671d887239d1bb2e663b37be73593b8ba7 SHA-256: d249c8e4a63962b001f168426cf86f11b121c20fd9c7793557f016c5a8ab1c8a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains multiple links to external websites, including one pointing to a raw IP address, suggesting an attempt to redirect users to malicious content or download further payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c420b71860---wegex.pdf In PDF document text
    • http://megat.pl/uploaded/fck_files/file/rizomozomojakave.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/538bedccbd4ffd7f07b743b68ab4bfb2/42185108938.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/vutapuferixepek.pdfIn PDF document text
    • https://wonkingchina.com/d/files/fiporixu.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/34503451848.pdfPDF link annotation
    • https://eventaipei.com/upload/files/wuzexupotudod.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/58989008398.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9fc0903d1---fobotorejemadodiv.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36956c2b3e---kaxizuvasoxiwefidixeri.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/zorepobesokule.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6007fe57f6---62152547900.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/naremirisibamusiwerila.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/1360013829.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/pupevuxusatadaga.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/xeroxabafelixukovopamigi.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/kaxexaruvetowi.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/68676689461.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/jugoxoxavekaramagutiga.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd35b6bcf89---19794361473.pdfIn PDF document text
    • http://centronegozi.com/public/8425023145.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/2695a08ee6a703144440784f13be4ef1/55713083020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=honeywell+thermostat+manual+rth221b1021aPDF 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_off0000e46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46C 11008 bytes
SHA-256: abd9a5411b83558c73cb5d4c035b99dd075e81a708d6360804c3508a86f827fe
font_01_sfnt_off0000fdf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF4 18128 bytes
SHA-256: 712cde14a0407acfd9c68a2fcc882a1af5e5dcfe0a5d7858050efc51c5edcb03
font_02_sfnt_off00012c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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