Malicious PDF — malware analysis report

Static analysis result for SHA-256 10feefe2b1af16e5…

MALICIOUS

PDF

84.2 KB Created: 2021-09-04 22:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9c55798077f56b862bf544b31e6405fa SHA-1: 83b3f3fc895573f9108156c3b13e88de8e6fcc0b SHA-256: 10feefe2b1af16e59a586412ea8187e94525de30dd2f9e979a835091822b7663
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple URLs with 'utm_term' parameters indicate an attempt to manipulate search engine results for malicious purposes. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware distribution vehicle.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=java+programming+language+pdf+download PDF link annotation
    • http://vetcasatenovo.it/userfiles/files/solavenerageganizolekitib.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/vn459tm52rn0j67jq806sgpg4u/rabupowetojegesakukekufa.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985ea0c8e7e---47841068638.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/mivujomapadaza.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d4eaea200fc---52230051573.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/pusebov.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/ginemimudameruvodilobet.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/df8f84d335803f08981d5e0a66dbb0ec/23259390820.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/47850830486.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c02eaf8e6a980298e771b1459adde9ce/43078231513.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b2afa53fe---12281730086.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/90168832346.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607238f91531b---29889756049.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/21621519178.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/96034665280.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093ad3e26c66---vusujitasozubi.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e70576c599---fobixopalived.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2bab8f18720d53d01881618fe94e2000/84217918020.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/xitisabesigixezu.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/5a2c45e99a23ea9a51c4f5c1760b4cf8/zuxolezufumupurorinor.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8ce204bf0---notokesujepef.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/57596026739.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c654b006ef---kitibobigoramusizow.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/37784541082.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/mirazibavesubarivajezo.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_off0000e23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA51 18444 bytes
SHA-256: ca6f408910552a94c8dceb2b5afceba419efd842ec8ce074abb13f3c1a24b8b5
font_02_sfnt_off00012a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A66 10820 bytes
SHA-256: f0cbe846ebb89185168ec6ceb4e4ef2f7a3b553c4c3fb82454c0325d24c1b652

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