Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4c4ced89cbf57e…

MALICIOUS

PDF

75.0 KB Created: 2021-09-19 00:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 36b1bb385724bd5be023f570ed4908fd SHA-1: dcfeb7eab8d81f953f23fa492954d58404ef2787 SHA-256: ef4c4ced89cbf57e0913c0792b1e6d79a208cf928d7c231de5aaf0d52b0a473d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=angel+numbers+444 PDF link annotation
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/19805110774.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16145dcc0c5445---xebidarepuna.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/sonudewejanuvofozijokix.pdfIn PDF document text
    • http://zzquansu.cn/d/files/43409559339.pdfIn PDF document text
    • http://dptour.net/bot/ckfinder/uf/files/87911380847.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/jibeniwavoju.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/90083925034.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/77247118168.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/befirotinibefozikapi.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/xuvafovuzotevelanulexuti.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141eb0cdc739---93101867398.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/nunakexo.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/fetubudaxizazikawusile.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/39309761272.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/50247685065.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a87ca0bec---xisiruvasigagekemozu.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c1661e49d---27325561633.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/xubojibizebovolarose.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/rifuvatadokumuga.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/tuxazasupugekesiru.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210918221450.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/b716d082a436cf449fac9a32d35c74c5/89670899607.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/jofumakusosonazored.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_off0000c265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC265 10276 bytes
SHA-256: b7665b8067b1f2fa04fa09e9d33b55175991742e5d821d147bbe2bf5db480e0e
font_01_sfnt_off0000d989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD989 17388 bytes
SHA-256: 22e9d14bb50166029ae44bf20c6d8676d04faf169c3fd3dc6ba2041e53653edc
font_02_sfnt_off00010658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10658 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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