Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8699c540642c4bd…

MALICIOUS

PDF

83.6 KB Created: 2021-09-20 05:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 433ac585b8b601d1d045815c28a5b171 SHA-1: 866141e069051ce046d4b910f934391b3c0e83c1 SHA-256: d8699c540642c4bdfc91813c8c7e0117fd983cae6e164f5a46b8544d627f6163
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL analysis suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://huntic.ru/uplcv?utm_term=the+sims+freeplay+android PDF link annotation
    • https://bywuf.org/upload/editor/files/punewuwimugakojetosana.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/46723039181.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/69848069345.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/ragisukebor.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/15017310546.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/zakigut.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/pazikap.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090316223453.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0d4a10026---75270059597.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/23818551048.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/24076825691.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/butaxiwotodinovupib.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/d0ed18546ece642522b5358aa2ea600e/juzilesigosagak.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/zorekidapuwebaxidoredivus.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/22978528489.pdfIn PDF document text
    • http://sunway.me/uploads/file/200023297458.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/junizonimixip.pdfIn PDF document text
    • http://vinhosnorte.com/images/files/jilopuv.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16145743f17399---19339934207.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/26881343401.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/vunipujolev.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/napixixaxasipolitopet.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/wolozagomugow.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147e56bcbdd9---98487302454.pdfIn PDF document text
    • http://boldogelet.hu/media/21133803337.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/f8710b12fb3f41e99ace0d58031e609a/37884886029.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_off0000e0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FF 10740 bytes
SHA-256: a85caeb55433afd5c4e97eb109d4cc5efc47c9e0a29062219cd817a0917c02d5
font_01_sfnt_off0000f973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF973 18188 bytes
SHA-256: be90f223a49071e3869ad6f0726a39fe96fb9c101b3e34c3ad6de14ef0f18996
font_02_sfnt_off00012888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12888 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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