Malicious PDF — malware analysis report

Static analysis result for SHA-256 9426153519ee8472…

MALICIOUS

PDF

92.7 KB Created: 2021-07-16 20:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 90a94b9ad7a0b3e632d9eb7c0a6f34e6 SHA-1: 93f97205717431bd1f5353c019f99080a4ef6c60 SHA-256: 9426153519ee84721dc55f42a605b02cf889321d6d80c348ecd588a96f8593ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links to external websites, many of which are hosted on compromised CMS uploads, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/b1eb7951eebb7f4f2bfec99771b0d902/26510572201.pdf In PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/237a453e903c014f08c2ff9f46be3a17/20037415084.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a20ed63a0d1---34377205328.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9524a63430---zezaduxolazokitozajumo.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/xodamejoberoloresadem.pdfIn PDF document text
    • http://abpaluso.com/upload/file/zikal.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/1cf368d15ad9a7764d2e8e1d815f23c4/42125439408.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/visujopisajejewuwewosudo.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/kafuxasunotegogo.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c415a2cf87c360db0a792a8b745c9367/98430527316.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d536bf9ab---73767679323.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021060711374873499.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/b0560cf60d6a2fac513308bcdf6c36ba/46221873784.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7412f3690f---80200467881.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/52549236160.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dac6db0a5---39242079410.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/21541077660.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/l12qaqrebvfic19eil3m8lqgau/kesowigadoturebama.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/93313412597.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f09e97c534---62024731073.pdfIn PDF document text
    • https://masukpt1.com/contents//files/dugemilevaziwituribeforaf.pdfIn PDF document text
    • https://actor-conseil.com/files/file/susufekonitukogotujudesu.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/39ff0c5d234ae30f64acd57895891a61/gitetewitesidavekifux.pdfIn PDF document text
    • http://robinsonsmithreunion.com/clients/879094/File/24280837580.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=quotation+format+for+supply+of+materialsPDF 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_off00010845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12057 16944 bytes
SHA-256: 9a684c344de23b2cccd26ec2e46735da32e88300779b0545fdc0a754bf1fe300
font_02_sfnt_off00014c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C8E 10792 bytes
SHA-256: f9a365f756f5980dc979d437a361ae96739fa89cefee778810bc2eefc421a52a