Malicious PDF — malware analysis report

Static analysis result for SHA-256 93db1091ab4614e8…

MALICIOUS

PDF

82.0 KB Created: 2021-09-06 03:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 43fead72d1d74dd2c921ad0071f8668d SHA-1: aef5ee73e5ef2c347929917301ac4c84dd244910 SHA-256: 93db1091ab4614e8f6b49acb474e43887c510c03b4be7eb3b129010086b0a00e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vg47v1i4adr4j5jhalur8ltlj7/88285195947.pdf In PDF document text
    • http://akvari-um.ru/userfiles/file/14399033625.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160737d828737b---juvoresasuguzasabo.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/12650141651.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/284921516e15138633782dd15c7a2078/turifexewogititapasuw.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/dibaxok.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/1362486376612ad89de7233.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/86590759279.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/44369765611.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/lutubokasifejizogafix.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/wikojesudetita.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/bimaxefemapipita.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/15884744585.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/fepujozirexezemari.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/ziboxadolexepejonosi.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931b3cf1ebb---87309543816.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/pusejugabunopapexumi.pdfIn PDF document text
    • http://master-br.ru/img/file/34057650968.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092bae5484f0---90078154908.pdfIn PDF document text
    • http://amandamaitland.com/images/file/72316917464.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/nelogokiketalejewo.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/05055a4165bac7126e8b71f724654708/lapejukalowuladivofigija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=breadwinner+book+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_off0000dc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC86 18184 bytes
SHA-256: a3f3a4541fc550d519aecd18e0aca9035ad29f1e5a89dae5c9680d49aca41910
font_01_sfnt_off00010aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BD 10548 bytes
SHA-256: a45a239c4da9665e25b2f78d1dc1c0aeff63f0c47d998a2991031f7a8cc6225d

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