Malicious PDF — malware analysis report

Static analysis result for SHA-256 c67011371144e34a…

MALICIOUS

PDF

70.5 KB Created: 2021-09-30 19:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 59777be9cd20bb43596dff1b7a467e29 SHA-1: 0bb73d06d3f09bb2e444913bbab98c7a1dbbdf88 SHA-256: c67011371144e34a38540f680e1be0a1196ad47a1272ac92c34c2830c2e55907
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URLs, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure point towards an attempt to exploit users by directing them to malicious content, likely as a spearphishing attachment.

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://allytemp.ru/uplcv?utm_term=apk+para+reparar+sistema+android PDF link annotation
    • http://vuonlan.vn/data/upload/files/49810512049.pdfIn PDF document text
    • http://mdtrend.hu/files/file/kofaxipitefi.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/gatafobufe.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150e934345d1---xebisobeduxokojenelo.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/vifizopakejal.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/ruvajopud.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/degofugo.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/88043721386.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133ba6ea08c1---27259129513.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/wedog.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/jebafuvesaguvolugataneb.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/89371678551.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/wetajepebu.pdfIn PDF document text
    • https://vietnamwelder.vn/uploads/news_file/dikutota.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/sezabetulafoganulexowon.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/lopebide.pdfIn PDF document text
    • https://clinicscrm.com/img/files/85012251090.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/kimemiwadebibabileze.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/doxenufosirozavu.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/rolufusigi.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/fexeminidisefupupobifawan.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/gdla937a7qma4e4s6jk3evp0vi/14516405018.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/regovunutuwep.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/7e8e5b918fd04d3c36845796d3ca559e/mibifemufutu.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/21746807490.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_off0000b38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB38F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA6 10580 bytes
SHA-256: 7f5b78cc25617a0e78ac4e7e1a129df4f6d9f7796e438573fa968ca2137cdd80
font_02_sfnt_off0000e3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DA 15924 bytes
SHA-256: fee8f2b13b25ebe9f8f84ffeb527ff166472267950374f6b6e957de18e928d2b

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