Malicious PDF — malware analysis report

Static analysis result for SHA-256 26aa8a9bd8737d6d…

MALICIOUS

PDF

80.4 KB Created: 2021-10-08 21:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: aa6ae6f744bcf3b4781b7f00f132c4b5 SHA-1: fcbdc6a1c8f15288bcc5bde9d618a73a23091d29 SHA-256: 26aa8a9bd8737d6d798d03f1197a497cb49a1860a99a477636a2763734ab7c0e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=is+the+new+moon+visible+tonight PDF link annotation
    • https://sunrise-photon.com/upfiles/editor/files/66859308487.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/531054981.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/46035522966.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/17080147971.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/38044088028.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/25157919149.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/fapozapamagiritejufe.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/86760805506.pdfIn PDF document text
    • http://hrudolf.com/userfiles/99113871371.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/84136895647.pdfIn PDF document text
    • http://bulmarconsult.com/files/polisefemujamizepuxawosov.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/kojatemefabunavitusute.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/67745680138.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/gojerizoguzarikizalu.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/47464181937.pdfIn PDF document text
    • https://ivanamihic.com/files/pirad.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/56130527769.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135eca555141---59647302417.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615bfe4eb9cce---49596906112.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210917160848.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/gumuxesunol.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140e391a0c80---morasupilamamujimotada.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/96204394738.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_off0000d2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB07 19200 bytes
SHA-256: ae94c45290aec7c159995451847c22bc5900d0dec05f2a55afde03c2caa3bb43
font_02_sfnt_off00011c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9B 10536 bytes
SHA-256: 727771429f3928d96093f248400676aa3399b472941828e7c18f05d605769d2b

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