Malicious PDF — malware analysis report

Static analysis result for SHA-256 b80dab158ba45974…

MALICIOUS

PDF

70.2 KB Created: 2021-09-30 13:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 63352fbd83ffa5a96771e162027631f4 SHA-1: a7be6dfa466b6bdd517a47966dbaaa5b78dde10c SHA-256: b80dab158ba45974605b6a43a8ee4cb0c9d88244c1d4cee4d5d4d4f2e6ed8109
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, 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 explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection.

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://synerhu.ru/uplcv?utm_term=android+ppt+player PDF link annotation
    • https://gulfb2b.com/userfiles/file/lezizomabejoj.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/49416176911.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399cdd1df1d---bagizajegemilazelez.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/79120571236.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139303666091---1817066200.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/suxavojadijutopedo.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/bupezu.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/defidalemiv.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/xanogegurirabufovuziru.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151b56e8a99a---84167034737.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/91521912109.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/27293380537.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/52572626705.pdfIn PDF document text
    • http://christopherdallo.com/file/bezawokuduzapolidalagu.pdfIn PDF document text
    • https://unosms.us/userfiles/file/vubokilosipigamejazo.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/pamerawoneresaxukov.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16137e874eb8de---wuvovadiwibuxogevomon.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/47550998670.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/lujevemodek.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/gumosopu.pdfIn PDF document text
    • http://195exim.com/datas/files/74954729557.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_off0000b00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB00B 10312 bytes
SHA-256: d8ad0bfc02a5e46bd7abb9f5eb1080b7c07de08927d820ee67cba3b41c12f26c
font_01_sfnt_off0000c763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC763 17004 bytes
SHA-256: abe29638fed38380810f3fcca08b364b24f9e3159579ba049a048330f857c383
font_02_sfnt_off0000f385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF385 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1