Malicious PDF — malware analysis report

Static analysis result for SHA-256 490e5e1d3ee7c840…

MALICIOUS

PDF

90.6 KB Created: 2021-08-12 14:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d2c02696a515a14b6b4a934db3a2d1d7 SHA-1: 05d9cb044bc1e3c55ed8ca105e479ec8b1156d8d SHA-256: 490e5e1d3ee7c8404980f92f3ecd115454570aa000f1760abf4daec079f43e35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://sunarchegypt.com/userfiles/file/texusapivasedijixel.pdf In PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/nulaxokeje.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/73306673297.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/74161104351.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/skrrc62cdg0hcabfq16rhkvkc2/xasabagatolamivabaguxo.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/woxopunegadumen.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/19032088618.pdfIn PDF document text
    • http://bonapartefamilynetwork.com/clients/7/7d/7d081654635712149502d88e72c54c2d/File/watabizonuwix.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/15036067088.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/63964985253.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608696ce03375---lidakojukuworegenim.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/kefazuminowetosadutikul.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/73803258151.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/33125e6b0bacf3e19b3c962d9cf033ae/82835106260.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/totimuk.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/aa475nbrkr19enfr6md0eht8bi/38915537405.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/80d653975ed7ab3ac8e10c2315730ad3/jumuk.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/zupizenevetofesojo.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776912bbb09---vudedugakimiperi.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/japamemokojevenogawoxuxil.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/9d6660234fdada3363226ff1de1c4b6d/30073475746.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610b4250bce69---raxesagiwekawumubigubapin.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1db9d7eb36---fapenudof.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/zolugefotufoxi.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114da535e18a---wumanadolowesob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=nombres+arabes+de+ni%C3%B1os+con+significadoPDF link annotation
    • 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_off0000f972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF972 19248 bytes
SHA-256: 7e255b959657d971b81761700fd9bb2364e6368bdb8274f3e3af9500d2091a00
font_01_sfnt_off000128e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140FF 10996 bytes
SHA-256: 010a3dd950baeb51cc0d1b0aa2cfb0a0804909e2a465cf66c1fc2c5d72bbbec3