Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc19650f99aa9823…

MALICIOUS

PDF

93.4 KB Created: 2021-07-23 01:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 66fff52e6d66e6a1664822ebf7e8e3c4 SHA-1: 56f774392f26db6bef419ac2890a767fbb64e07b SHA-256: cc19650f99aa9823f6581ace7eb082761fc7a50dbb24bc9349fd40fb8cff4e2f
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 compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The primary attack pattern involves directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609efba5dbdfc---82059616404.pdf In PDF document text
    • http://coinproject.com/userfiles/image/file/13799956190.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/72004268653.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160785cd5013cf---tubato.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/17281850508.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f50fb4dd58---43737625752.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/fccff7f7706eb7c0f1f609d10f06447e/43128195960.pdfIn PDF document text
    • http://stylekd.ru/files/36850477045.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/wunuwipozugusa.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f6676d036---56146661175.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160acbc201f957---bawididaxotusimenumibab.pdfIn PDF document text
    • https://rjpexport.com/files/wuluselid.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16084b5c920a59---37534658188.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073488ff327d---tageki.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/31456049371.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/e73a760f305e739ac0d97356eaa5770a/jamevatulubegaxu.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/80023240174.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083582c5b667---bikizexibufum.pdfIn PDF document text
    • http://inncredel.com/uploads/46343260129.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/nozuwifejabujikifomorat.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/53vjig4a2m9cgftti3srni13a2/nosugorasaxotezisesefew.pdfIn PDF document text
    • http://sergey-yushkov.com/pict/file/49918819689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=connecticut+prevailing+wage+rates+2020PDF 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_off00010571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10571 17400 bytes
SHA-256: b503fb8ab76a027461a9a149639ce247722f1224f298f0c816ce1a3aa735d437
font_01_sfnt_off0001333e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B55 11076 bytes
SHA-256: 31426e432312c9ad4c5f4b4061b34e82652fd80936710e9773bc909c690371e1

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