Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eadf88033d10c02…

MALICIOUS

PDF

88.0 KB Created: 2021-09-11 06:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1f58dd23e457e553c17eaa445f6808aa SHA-1: 6bf3c23c8bcc58bf82f52b94394828a751b28068 SHA-256: 8eadf88033d10c0294ebde89246239c21be0f890671f1bc8bd9bb5f4a4a31acc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chcial.ru/uplcv?utm_term=song+pop+2+android PDF link annotation
    • http://marcth.pl/media/fck/file/popesefan.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/penofubodibu.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/70603524954.pdfIn PDF document text
    • http://getdol.com/page_data/file/xomuvitodegolugi.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/81690978917.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/24170329893.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/lasugafumu.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/77320368962.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/sugasuzet.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38860130996.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/89503247531.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/20376349061.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135866791478.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/45882559889.pdfIn PDF document text
    • http://ned.ru/uploads/files/59379561101.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/51495721148.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/020816384f8e937dca2452e8dba13160/86673709425.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/datuxoji.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/5a6258d4b375b792fd9264f2f5944b18/poxidopaz.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/10142863607.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/49372502550.pdfIn PDF document text
    • http://klpa.net/userData/board/file/niralanelisixiwefufixaju.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/tuxirofar.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/niroribuvogarurex.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210905_B2BCD6699960D78B.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_off0000f344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF344 18332 bytes
SHA-256: 89536fae7137c1d7b6b1d97e490de71dd23ad8145f745c2859c37a3e61221bc9
font_01_sfnt_off00012305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12305 10320 bytes
SHA-256: 108c35d37ff05338f06d7b26305717979944e0b77c76f9fc082d4952375a2a0c
font_02_sfnt_off00013a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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