Malicious PDF — malware analysis report

Static analysis result for SHA-256 70685de144be3a89…

MALICIOUS

PDF

82.7 KB Created: 2021-09-05 06:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3a0550c91997359129c11ce0fad581ea SHA-1: aa48b32efbb9141be4ae822cc34b1bf14332909f SHA-256: 70685de144be3a891cbc4556d4edad3316a979ad37846bbf1a98ced537f8cf26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=gcse+english+language+paper+1+2018+pdf PDF link annotation
    • http://www.valathors.com/ckfinder/userfiles/files/lodimiwiwurupedig.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/wowunifanokim.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/03f9157adffa705e0712b7cc120b6fbe/32116890535.pdfIn PDF document text
    • http://staropolski.net/Upload/file/dudiwefefu.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/7032d5949162c490c4d290c3f44f0bc5/9602031263.pdfIn PDF document text
    • http://hncastlecable.com/d/files/16982344351.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/xegipopajata.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/vem6hr0e3ldnpgpudum2bnj5cp/nuwepifi.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/72282492444.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/joberidanudomagebanabi.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/6c2250c38d7128c8dcf74c9621eadd46/gunutodavagevuzawugo.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/fixuwepogevipubago.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c17ade76469---65771229085.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/47536970745.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/32584644086.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fcfd2ecb2---guzadasirugezabad.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/8629081436.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073db93332d8---bedelinejetuzusaliweruz.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/neritemumomikakilezinataz.pdfIn PDF document text
    • http://midel.me/userfiles/file/semaremitexopijujegu.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/0fd2f06bb36277f52026e435f638deb1/67318993634.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160858270881a6---lulezuwiragojotalujek.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/77478124728.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/60561874963.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_off0000db46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB46 18268 bytes
SHA-256: 2b5a6693648f60298125338e7fbfbefbd12b318ad342df4375661d13f11c5a92
font_01_sfnt_off00010a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12237 11320 bytes
SHA-256: 769e1ca5625c8aa67b7514ced81a0b92ae0fcdaf95c8116b1f40749835c7c007

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