Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0cd6dc8ee80c7a…

MALICIOUS

PDF

81.1 KB Created: 2021-09-02 18:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 2a1ead203cd13ee950bbd8689683804f SHA-1: fd1e579e1b3ff306b44095559362d6064f21457e SHA-256: cb0cd6dc8ee80c7aa76f88ca5e7c865b5b95035f71a4aa0f5a2ab086e4936029
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ujo0ae0to4gbvca0q140k8of64/birovezapi.pdf In PDF document text
    • http://fitsiluet.cz/data/file/zuforemu.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/36686225145.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/21715517915.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/4cdb353354cb5e79dab269bc9ef0e21a/fusiwiruni.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210825135552632.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a15714e7ffd---gorexatopikuwivulisolo.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096551909f22---1779666347.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/62458496766.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/lobumubej.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073486989e62---ginoxumeri.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/92832c8ae62ad3819188cb93d17bfe3f/10352028930.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/35343077835.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/26609061613.pdfIn PDF document text
    • https://greffedecheveux.center/upload/ckfinder/files/10626649193.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/4ss387b2dtfak5odcp13vo1kp1/44212782691.pdfIn PDF document text
    • http://normel.org/files/upload/file/6012576108.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/daab7855f268fc8efc76af6b33ca27e8/zitoraburudilob.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/dudorabazoxowofoguk.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/55998944189.pdfIn PDF document text
    • https://miet.hu/kepek/63418983551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=electron+configuration+of+elements+pdfPDF 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_off0000d792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD792 11044 bytes
SHA-256: a27c2fd8e62246e474e86fb56e6814f83cf2b10bb3ce33c996d9c0aee52c78b3
font_01_sfnt_off0000f110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF110 17564 bytes
SHA-256: d03737079447789b08764e63abae2d53215fde333ae7b1c297a8a5b971dcf3bf
font_02_sfnt_off00011e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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