Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f97c06fd40500d…

MALICIOUS

PDF

81.6 KB Created: 2021-07-08 04:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d6ee8632c375203638c24222f6b627af SHA-1: 67cca87eed9c90b4f8352bcc854334360e3efd57 SHA-256: 87f97c06fd40500dfd4f4ebc667c6fe29352080c541924cb6b0d68832e37fda6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous URLs points to a redirection-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://coretry.ru/uplcv?utm_term=perpendicular+slope+of+0
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c21227cb26---94141912597.pdf
    • http://teifsepahan.com/files/file/83789522687.pdf
    • http://ud2-140.com/files/zoxukogimolalamonalixuf.pdf
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/sejapebukofilanomewoke.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/887a1e2c3e1e05c160741215c48a20fc/mowewujuneg.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a3647f3dc---mudusumizonulug.pdf
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/pazejemanopisujosego.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/2b65c8bda1d95190215f28cb1da3ed22/bukufiges.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f4744a25ac75b24e113705d2122a34a1/7285900356.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bccc0902fe4---gogipomofikurikivi.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16094d19bdc3c1---69307635227.pdf
    • https://okud-istra.hr/userfiles/file/mibesetarikurifizuwo.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc8483e0ef---38837151154.pdf
    • https://systematix.pl/userfiles/file/jugojexasip.pdf
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/wexojinofonafotexufosidu.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/616604625.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25b0c9096e---79670450457.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/aed65d07b5f9416a2d7bfc3be0e2b1da/jokavegidis.pdf
    • http://hoshitorionline.com/uploads/files/42959391526.pdf
    • http://brlairport.com/images/file/giwozewajuturivoginarir.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073eda796bd7---jerum.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/0cca19514dbf634104659208caf9509b/50550817711.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db87.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB87 16792 bytes
font_01_sfnt_off0000f39e.bin
203fd2de75ed693efba85e83fa8938d7c1de4c4768459b8015668afac8e3f25b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF39E 10736 bytes
font_02_sfnt_off00010c56.bin
7ed12197a0b136db170fa2c3956ec7dfc1c24f9104396eaefc6ee72405c27584
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C56 17028 bytes