Malicious PDF — malware analysis report

Static analysis result for SHA-256 241c77662fae1ab6…

MALICIOUS

PDF

69.6 KB Created: 2021-09-08 04:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0fc1eecf097e0aababd0546e51cd5fac SHA-1: 4fd4971f0355d8e93149098007d7466cb2ccbf45 SHA-256: 241c77662fae1ab678f7e243b2eb3f7a22af61aa6ef9cf45d64feeb5eac5c112
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs that point to compromised websites and disposable domains, functioning as a link farm. These links are likely intended to lure users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=cen+tech+battery+charger+owner%27s+manual PDF link annotation
    • http://adabaskimerkezi.com/upload/file/bagivedepamubor.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/8de9cc528387343ec0e1db21cd2179d1/27945858760.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080a3688db4c---12389739561.pdfIn PDF document text
    • http://vo23.ru/upload/file/bupozukijosorubexorugub.pdfIn PDF document text
    • http://dyweisheng.com/uploadfile/file/2021071923343173499.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6765808904.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/44077161087.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc995caed0---61572536082.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/87352692648.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/wikemebekuduzosizaduno.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161219404383e2---tumexiveku.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/92996218924.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/99633069526.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160778469066ed---12164933257.pdfIn PDF document text
    • https://esvigo.com/upload/files/ruwetudetozexuvedijawi.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16079586029329---jakelapojejarizum.pdfIn PDF document text
    • http://bakefruit.com/uploads//files/202108021844525920.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608307ef57468---xozosaxisiwinebepo.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/54591091400.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/5d2f17aafc54885cfd55f0eb587fb7e8/rigesajinululadu.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/a597bb2f924d2e53ca7c133cf6681c8b/wuban.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_off0000b168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB168 11092 bytes
SHA-256: d0bfed69848416e6f987d05781046c2f9e062b714aee487d50e5d85255e1cb98
font_01_sfnt_off0000cb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE358 15012 bytes
SHA-256: 143e6c383df31782aefca2598391457605b4341f526883cb3970e0f07388a10d

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