Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93c7007f6c38e64…

MALICIOUS

PDF

65.1 KB Created: 2021-10-04 00:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 14cdc0acde7673daac270c384139aeb9 SHA-1: 91d63e3c08d691aec225673dd91e7383271ba543 SHA-256: a93c7007f6c38e649ca280fc1c145e7d642f7d54186128f84572c44c46814a9b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6298

Heuristics 5

  • 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
  • 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 http://kepco-group.com/uploaded_files/userfiles/files/radap.pdf In PDF document text
    • http://ultraljud.nu/bild/files/fisipawekaxi.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/bibezurukedepizisajosoxa.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/viboz.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210916182911.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/gusisopiva.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355f8e005b6---46369403820.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/72502051793.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16155e804144ad---46956702278.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/wuwewefabenimigasefot.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/14125362465.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/girunaxelakim.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210913101034.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/kobefop.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/32621516194.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/96679632122.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/ladebuzepepepusufejuregi.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/88229333006.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e8de784b7---wodigu.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/23196370.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/tumeb.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161424bb92d5eb---xetux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=granny+horror+game+online+free+play+unblockedPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F0 18728 bytes
SHA-256: 2e3c153d581a4b51f027695eba1fa68b6adcc490630ef5cecef7693d2f180990
font_01_sfnt_off0000e32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32E 11284 bytes
SHA-256: 9067d5fb84fefed28a579adb13485dad6ded6b03fbd642066fe719127440458f

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