Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb89aa88a69ce0e…

MALICIOUS

PDF

104.6 KB Created: 2021-09-01 23:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: da1ad247a1c9a5a39b370059778e836d SHA-1: 3f81174476dc42836393c3b5129fd17ad06fe649 SHA-256: cfb89aa88a69ce0e3c57a5496c271a49bfa9888a96fef41d16f5809fd8ca1f2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the structure suggests the PDF is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=english+channel+book+class+5+solutions PDF link annotation
    • http://hanboo.cn/Uploads/file/2021072514463770554.pdfIn PDF document text
    • https://tisuputih.com/contents//files/7842599007.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/10191045816.pdfIn PDF document text
    • https://go2germany.ru/files/file/xorejefepadefepilen.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/98815900069.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfd48829e0---xejevedune.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/3712362570.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16070a361967c8---11528276405.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad3449ca82---61355156185.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/9118587548.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210807_9695FC52360DBD27.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab376edfad2---21496834281.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/3311705190.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/fejurukuzemejejiga.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c583b3db7e0---18141651003.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1abc5ee90b---33856315059.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16106f9e78c472---88486823930.pdfIn PDF document text
    • http://air-con.ru/upload/files/64564609882.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/39001200241.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/7b7fd153ede30a8bf41592f2511286be/bawaw.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/bajirajesamolaxerofefu.pdfIn PDF document text
    • https://hostmegasoft.com/calisma2/files/uploads/sifedakosexowezux.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_off00012f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F43 19464 bytes
SHA-256: e4b5e406feb9842a3119ebe5f5b10d7bec8d8becaccaeaf1e645a467806f28a2
font_01_sfnt_off00016268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16268 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A7F 10860 bytes
SHA-256: e9d841b56c378c3c31cbd4d243490db8f58a5f727836786c15665d692f3a2732

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