Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b0065957f6de74a…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 01:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ccf64c5392ca35443298d045ce42b0e4 SHA-1: 0d5906488734701ac5f7f77c63bb842d11107f9d SHA-256: 1b0065957f6de74acfe562616b51e144d9d2599c567f4d317c18785cdd159a26
156 Risk Score

Malware Insights

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

The sample is a malicious PDF detected by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded links are consistent with a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e5c33fffa---92682655861.pdf In PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe4a856715---duzoduluz.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/pilipugusakuworijetosejo.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/10744212382.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/dojabixelifodijekerojolem.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/d022b5c15b4124d7f22c8f371716c628/73059010500.pdfIn PDF document text
    • https://humicdp.com/uploads/2021-07-05/images/files/domeba.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/nanumubogo.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/minewexuz.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb41ce3eca---8705091012.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/fesedozamitalopakeraki.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16098de3a3d04e---21089382155.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/simawupilatebajukigapoti.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/98431134683.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/30577858280.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/9vquc8jtg8e9m2p2pt8osfgoco/vitukaketofikikopekole.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16116b1bc50ae1---deridag.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/282a460b0bbf258be2e1e3e9ae606ee7/62574152467.pdfIn PDF document text
    • https://funke.be/data/file/danajigonisitetine.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/kokolupipudogubol.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d255f4c22629df28a94e622f6e6ebb85/31266461565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=simple+resignation+letter+formatPDF 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_off0000e1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CC 17564 bytes
SHA-256: e76e5978eab23950209cf85b75662dc2aef44f7e00d2710478d6e812bb1cb8f7
font_02_sfnt_off0001271c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271C 10776 bytes
SHA-256: 9f48746302cc608a4483dc8d4f29b452f1fbe7cb237ed26d8f045e888dc6b23c

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