Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6b2e3fbbbfe60c…

MALICIOUS

PDF

78.0 KB Created: 2021-09-26 08:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c0df78161667977ba869c3f37a7f4bbd SHA-1: 82c7198f1b4fdafc75c15095a9544006dfff282f SHA-256: 8a6b2e3fbbbfe60c87d99f0a27be9f5652955a65773a647a277657159c2a3396
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised content management systems or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the link farm nature of the document is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://aljuboori.com/userfiles/files/vadaxowemefevawuj.pdf In PDF document text
    • http://wxdyzs.com/userfiles/files/lisotimelukudivivulub.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/fomenavexovopasukiwisa.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/jojomijaxigiwadigiwovixot.pdfIn PDF document text
    • http://vo23.ru/upload/file/tadafigosole.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/99973002732.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/lutudamitilirolinitu.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/xusilesifonimosasot.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/kiwapidedufodas.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/gotugigibolisaliw.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/garivusu.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/fasosajukadomurakexelizud.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16135be8825712---52920778580.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/91133393348.pdfIn PDF document text
    • http://trovas.com/userimages/zedavunagomoxunim.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/kiwifexusomifofetizukemur.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/jagoboz.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/1gqvjmua30ei2vhap6vb9imha1/magexeno.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/b640f24fcf3fb616d486dfaf42e6c203/56944226364.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/rixufakolidogatokux.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449462edc57---96926824002.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/nevatofixemujujil.pdfIn PDF document text
    • http://redactron.com/userfiles/file/nanidizam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=why+phone+internet+is+slowPDF 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_off0000c556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC556 10380 bytes
SHA-256: 27c51defb5ec9673b3f3095efedd97b0bcec16ab73cf87a4b315652aaab3501b
font_01_sfnt_off0000dccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCF 20404 bytes
SHA-256: 7fbde8df88448074ecdb43c277229177cf97a4d1de582bc023de500301606fa8
font_02_sfnt_off00011240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11240 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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