Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4632bc0e0a38d16…

MALICIOUS

PDF

77.1 KB Created: 2021-06-29 01:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d4fdb089f88aea6fffa967cfaac6bb70 SHA-1: 57e2d1b6d285dc3bf004a19b681a69645b68448b SHA-256: b4632bc0e0a38d16d78cf08ddbab80336383da08914ac7811bbeea6d00bc24dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and link farm heuristics suggests the primary goal is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://medvor.ru/uplcv?utm_term=100+catch+phrase+answers PDF link annotation
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608111ce09bec---64512335455.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/9f58e235ceb7e27999120eb697e5f45c/43814934611.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/44923998787.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/92811468666.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b84bdb146f---84504279987.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/t9h799bv36q9regb3kb9uv0llj/lezobu.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-29/20210429072102545341.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/349aaedd7f2fa232c202685b05e64075/17643825062.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb7ad39516---gafusaga.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/sutotizivuw.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a489ed91b61---madoxoxirovix.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/98d75c5e77cc87fa756765db69af6590/92898101051.pdfIn PDF document text
    • http://austintownfitch1980.com/clients/879833/File/latorosefivoxedovavaxos.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/31951526770.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021062810112747.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812223252e2---temos.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/17be4fa6f571bb790d0af961eb92fd75/gopiximaluzuvefokodapobi.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/20215271948.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/81066866277.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16070dccf814ee---70737546962.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/29047744624.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/51l5hku7k2sreo6ivpv1auknf2/beviwajotuzexeposijisa.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/a6cff685a3bfd68cb908cdf6c9a2404f/mepowujagafafiwa.pdfIn PDF document text
    • 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_off0000cc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE419 16804 bytes
SHA-256: b0b9ee7270cd6bc131088dbccfe5836fa3c2654fd43491e83fbf4d23aa0dc67b
font_02_sfnt_off00010f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F97 10376 bytes
SHA-256: b2a07ad3eba8667179282265a434427e2f6131a39130817afb2a4717841b5b4b

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