Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbec2a325ab50faf…

MALICIOUS

PDF

90.4 KB Created: 2021-09-05 17:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9d4c534c9e2b131f86cc8490b99f3c4b SHA-1: ef9a053ac9e6701f0a152599ba7c6f2eabf00ee8 SHA-256: cbec2a325ab50fafcd44facc092307c6a231a7e7c3a275fc331c0d93b0f0a491
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, despite some being marked benign, contribute to the overall pattern of directing users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://lctrading-gmbh.com/ckfinder/userfiles/files/wulinotiwi.pdf In PDF document text
    • https://hogies.com/includes/template/uploads/file/fugegipebot.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/pipilebazukuwoxup.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/gewibekebosetub.pdfIn PDF document text
    • https://tsegypt.com/file/nasidovedanabanodebur.pdfIn PDF document text
    • http://ucity69.com/clients/861769/File/29155997058.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/1bdd23869a8898a618bf4fafda04d535/28131383555.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e63e0dcb021---64440828305.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/tugobaturiranodoxuzatub.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/f95ec3e3e2752a791c0193bd3c6d5a99/97369535417.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc694c9f1a---kasuzibag.pdfIn PDF document text
    • http://quaint-house.com/images/blog//file/52849230971.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/36776781936.pdfIn PDF document text
    • http://micruts.org/userfiles/file/fotasujikewozofumipuzov.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/debasanimarutojagijadu.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/57292478101.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/wodegolevajodigero.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/86975723687.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/xutujudez.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/32340033036.pdfIn PDF document text
    • http://gfhs1978reunion.com/clients/56625/File/zosurag.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/59983929490.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084987e8123c---wekepigapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=luxation+ant%C3%A9rieure+de+l%27%C3%A9paule+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_off0000f6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED1 10672 bytes
SHA-256: 8317d19439001fcf67d396b1c59ddfca848ebc54bcd6d83a23cddac8ccb3f013
font_02_sfnt_off00012714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12714 20036 bytes
SHA-256: 96fe0443db35aa8694a435d6a60ce98f836afd3a5d52f1cb05a0b93669cbe112

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