Malicious PDF — malware analysis report

Static analysis result for SHA-256 c255c5dbfc7b934f…

MALICIOUS

PDF

105.7 KB Created: 2021-09-18 02:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4b158a7ffd0310ee31cc15f1532edb6c SHA-1: 67904bec5fc6412bc13746a91b8472ab7576c5d3 SHA-256: c255c5dbfc7b934f0cf5c5d1bfd7cbdb5951ca350d8e330f562255828adc7873
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely involving the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pixomot.ru/uplcv?utm_term=kannada+stickers+app+download PDF link annotation
    • https://anitt.in/ckfinder/userfiles/files/zimuxut.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/zirumipuzuwo.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/508722a7e000fb5b7842a61e1f52121d/fitazakirarabebavuvaza.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/79992436462.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/76520241615.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///76769970775.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/83059658175.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/labebat.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/86302477383.pdfIn PDF document text
    • http://hmed.vn/upload/files/ribibonarilewaso.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/xetovefogawejaxalopot.pdfIn PDF document text
    • http://amirmazandaranihospital.com/ckeditor/files/files/99846606092.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/4974564997.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442b5d985fa---85981930304.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/zepodoneseziremobolofixu.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/toravuzojuvalozemufuj.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/86194002817.pdfIn PDF document text
    • http://strandedtattoo.info/file/kisazifuxorokipufejux.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/jgp62km2gdk3tp5ra45vimhhj2/vasirivuzijixem.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/98883042404.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612f7d77b9a1c---47855215714.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/mosarofopexununodewu.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_off000134cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE2 10676 bytes
SHA-256: abe052a5be3a2994815105735be1211280886aadcbc115b0327ebfbc71f70840
font_02_sfnt_off0001657e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1657E 19656 bytes
SHA-256: 622bf86ab894ab6d0e3e7886fba7a48b291c67d2862895fd7aa0bfa2e17e9cd8

Open this report in the interactive analyzer, or submit your own file for analysis.