Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ce8187867322e4…

MALICIOUS

PDF

97.9 KB Created: 2021-08-16 00:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8b7b8dc8c6472a4590727188b4e2a664 SHA-1: 4b70911a99ac191f5488248eaf312ef552389c84 SHA-256: 41ce8187867322e4475008680cb85bd2bdffc611ff346da296e0a730247a536c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=how+to+connect+arteck+keyboard+to+ipad+pro PDF link annotation
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/4f604bf9c81ca16c966c124cda4bcef7/negirugizorot.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/buwiguginuv.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/tematob.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/82801046055.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afea70d0052---vuberalo.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/xakebegigupununetogikaxup.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c8e30308ea65a6dd25f4ef86cbf70a62/54678747437.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b00e5d292c9---59780124694.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/352eeac6776b81c1a60a5c36c194cdca/55474340030.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/92519364438.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/46i1r09ogtie11sos8gral55h5/9361145010.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/a78fab680e7db2b047083a20b9b69849/19350190467.pdfIn PDF document text
    • http://glassco.ca/clients/9/99/99aa1728c1dafa3cf8773a75727b87c9/File/27111967939.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a14ecc06db---vunaditujitosowugetota.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/wofarunujibiwolofesa.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/08e43aefd0ae060a2ea361f8f59aada7/wakedodojiberawuvatubudak.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/10195408653.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/an8stju54i5msm9aphkbgf5cbg/75492356737.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/bejomaxukesapijoputofoti.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/69100170232.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/30550904706.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/bobapa.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210730004838.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_off00011cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000134c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C7 10716 bytes
SHA-256: 9472b034472bea58a2d92ee390b0e1a2281f379abd0faab689fd2fa5f16ee84f
font_02_sfnt_off00014d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D50 16872 bytes
SHA-256: 3d7b577c0c7e38668aea745f3858842de19b30b0c0f2017d2e1dbcdae7e10114

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