Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99f622b57b11a42…

MALICIOUS

PDF

75.5 KB Created: 2021-09-05 22:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 16981e3692c9e61686a98d7be4d7d97f SHA-1: cbf4ce633874cd8c7442c215cf2f21faaf428ea5 SHA-256: e99f622b57b11a42a3eb37560671ce9c5ccc331102b031b3f1aec6211bada22a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various external URLs, some of which are hosted on compromised WordPress sites. The presence of multiple links and the nature of the hosting suggest an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/5hafu399du7f04vbgdk4t4vc11/tilifigatiruwolotafemug.pdf In PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/tolodidagoja.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/73993843275.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16112b3ad6a114---xurotuvonobigizanupafu.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/fuwawufojukuvekumafubaw.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/2820571005.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/v0v53an86b1cqja2ji9i35oap9/dubinijixa.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/gixemigitukosifix.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/61145635758.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/89471594770.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610a52fe59380---gulawodejeromusaxuwuwo.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/tubutubaxijune.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/kobojupowiremago.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/39523829169.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/87263380510.pdfIn PDF document text
    • http://better-pharma.com/images/file/files/28828935396.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/vipok.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766828ce823---66571992832.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/50f9e79080cb568fc7c6df8e45b9c2da/tajobomawofodem.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160721aa370cd3---kizulokekobivo.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/77374018245.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/99467678056.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/jibavogujikosalover.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=adding+subtracting+multiplying+and+dividing+mixed+number+fractions+worksheetPDF 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_off0000c436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC436 11748 bytes
SHA-256: 95b762c03d7d6da7d9489a714e0f4969ebce40c2eb87b76522becbee534e3918
font_01_sfnt_off0000dfc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC6 15724 bytes
SHA-256: fca70e26d214d2b7bda7b6a98b7fcdb7317b1082dfd44797817505327c7cc21c
font_02_sfnt_off000107f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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