Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac223b373fd98ff4…

MALICIOUS

PDF

71.4 KB Created: 2021-06-22 09:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 0387247ec233f23ca0dcdc9827fe3e87 SHA-1: 0d778925a1ece6525934e6b1eb2e62cf4533f93e SHA-256: ac223b373fd98ff4bbdcbd91971a116df3d5f5282d99896993325100856b4708
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://andrejc.si/files/file/46529489516.pdf In PDF document text
    • http://www.contectrade.hu/fckfiles/file/pizezizuvibupen.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/58560182306.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/rekiworokatosifosev.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/rajagosegepomuk.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/pnh54fs69fkjtelq3d6eqrdesr/19476053531.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/6105571340.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/1bce6cc86dea137baea1601b0d41d082/kijodozavowoxano.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/81049860022.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/19199163894.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/23329515424.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/15761856007.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cf314c32a---tujesukomexutanagoko.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3631f121a---vizoboxesafulutin.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b2e29753f---30978396707.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/bisufe.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099614122b4e---82289404438.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608462a95fd58---95661494041.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/dumafukupuroxunaxurevig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+whirlwind+girl+season+3+episode+1PDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87A 4648 bytes
SHA-256: 8538754d24bea1c8e14dd7329fbf3a8f30b6b53caaae90ba683a4dac4bb4273f
font_01_sfnt_off0000d8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EA 5476 bytes
SHA-256: c7aabfa2b87362bc5bd540e689c92ff3152bc73c9140c88348012ee3aa0f6465
font_02_sfnt_off0000eba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA0 11000 bytes
SHA-256: bf73f3fc5e353d12cbadbad5736962c54866b6a86f810596c255cc4f14589301