Malicious PDF — malware analysis report

Static analysis result for SHA-256 92da5d4e93ae195d…

MALICIOUS

PDF

83.2 KB Created: 2021-09-25 01:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 05db3797b3d9df6b7a099a05ec50445b SHA-1: bdf5c07bc84e7775a6df0465af2f56caad0e753f SHA-256: 92da5d4e93ae195dc43bdf6da30c5d6e092a36833ced504568c1e38acc593aed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://garglob.ru/uplcv?utm_term=pubg+location+hack PDF link annotation
    • http://avtosfera28.ru/userfiles/file/91466028229.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/pixomijunawiwuludiv.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/kezetofivomokezenefe.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133eb9657a90---7631346499.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16145e66ba2016---rofafasiv.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161397eb588a6e---kixawububopeguxawitidil.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/93762629831.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/91351261633.pdfIn PDF document text
    • http://e-district.org/userfiles/file/28499593259.pdfIn PDF document text
    • http://dubossari.es-pmr.com/constructor/dubossari/ckfinder/userfiles/files/juxamoxovulas.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/fapajujazobaxunuvol.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/pugawawepisetimogogi.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/nuxuropidivunik.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/dubeguwafiwumobobu.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/wulidajoguvigizoda.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/51494466526.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/favakekiri.pdfIn PDF document text
    • http://descanso.verareyes.com/ckfinder/userfiles/files/wonaxazativumamewajedo.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/83797912185.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/juluzuvufavifelavamakirak.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/laripiletaxomi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c32bf8769a---17014324683.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/7840587432.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210914090943_141057004.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_off0000ddf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF4 10440 bytes
SHA-256: 9c75295c2329ecd518c1c3975c9b9255600446183018fcdbd8b6d96f26e05e1e
font_01_sfnt_off0000f580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF580 18976 bytes
SHA-256: 4e19ab8abd049fc334df870b07b3aa2838a75f83c25615ec5426dd55d5212a5b
font_02_sfnt_off00012798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12798 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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