Malicious PDF — malware analysis report

Static analysis result for SHA-256 323cbdaff8700a96…

MALICIOUS

PDF

70.3 KB Created: 2021-09-13 01:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1d3eeff3bc7e754bf7825c3542d14c19 SHA-1: 14f518cb07c68c46ef4ca67f81d98a433c1e689e SHA-256: 323cbdaff8700a96e89a07f754008b02a5eb08040e63a5fae527b601667936b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with a link farm used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=note+4+fast+charging+not+working PDF link annotation
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/i7l5b1v88mka9u7pfea4b85k16/pemejidifawulov.pdfIn PDF document text
    • https://dintek.eu/uploads/file/dudaduzirunizujufukifo.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/59291748590.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210913013414804.pdfIn PDF document text
    • http://rubella2.integra-sh.com/userfiles/file/nalabimizewos.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/xobixo.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/47465933410.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/futebisobogasuvuderufa.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/mijosu.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210908140117.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/81452038619.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/vawane.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/14734948429.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/75322755202.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/zitevufabi.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/15783174806.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/98204761183.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/86098352463.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31673153295.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f697c2dcdb---41407353898.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613058bb16ff7---35344105020.pdfIn PDF document text
    • http://njchemland.com/upload/files/werevefu.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/sedufugomowixuravi.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5c496b0fb---kibomowogobusur.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_off0000b352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB352 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB69 10804 bytes
SHA-256: 546d8c2837d22ffedd21a6e0adf3a4f4b5e2ba061f77d824754d2f17049abd59
font_02_sfnt_off0000e469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE469 15400 bytes
SHA-256: aabaf67bde0e2984a44831f410d3a53578063ea6ab8f8a56d26eddc0d9775bdf

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