Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58bd7b1b055bb70…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 17:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1ce0c01f84c15116776abee06f7b8684 SHA-1: 4bcced62574ae026be54214a3f666cc46b50e8f0 SHA-256: d58bd7b1b055bb7002bdc4a06b5beabc72147bffa340ff45b3a9ba9db4480dfe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised websites and link farms, suggesting it's designed to redirect users to potentially harmful content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports its role as a lure or phishing document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://crewmak.ru/uplcv?utm_term=how+to+change+my+voicemail+on+android PDF link annotation
    • http://architects-desk.com/uploadsfile/24984702403.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/1bf41d0a0b8109185601cc6fe43f6db0/nonuwinelaperajumu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/egf60k3cjgetshjato1k1qhiv6/lezotisekoxifitovepep.pdfIn PDF document text
    • http://medica-brno.com/files/28466170948.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/wivemi.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090818021111904.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/fimufigejite.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/lirapujepevalotegoxugoj.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/g40679o1hsdt5dmi8r809tujk6/tiwozogawe.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/50072850266.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131504e4c7c4---xuxosozotijetonifofud.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/jufewefikomideduxod.pdfIn PDF document text
    • http://boldogelet.hu/media/bawikegugu.pdfIn PDF document text
    • http://teakdeck.pl/files/file/rusijasojaferevajog.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614224db91758---lepagusuvinimebudeb.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/wovofimasonudawulogux.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/8493110783.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/koxepizuda.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/terebajexo.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210914_FDF839B73A07D95C.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/69798322581.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/43445751197.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/85938167349.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/goxafa.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee0e7932a1---fufotavokufujazexuxu.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/20159352235.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_off0000d7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCE 17644 bytes
SHA-256: 8198a905a4328f71800482d2dee0643a7f03929e46ff3a88619cdfcfcc14ea79
font_02_sfnt_off00011d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3C 10904 bytes
SHA-256: 75eccad43b760c859b4cb883d17a31f36f07837bda17a303897d9db7ef37ae41

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