Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ba709a39f9b223…

MALICIOUS

PDF

88.5 KB Created: 2021-09-17 02:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5f201f53bcc4b1e0b1172506a5a02fed SHA-1: aca0e421ac86e55c905b39b36e8af68da0539ede SHA-256: 76ba709a39f9b2234addced3efecf6f46f2d2239c7d2c05ba91cf2b12e2138b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's used to redirect users to malicious sites. The PDF document body is heavily obfuscated and unreadable, but the presence of numerous URLs and the nature of the heuristics strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://aldea.work/wp-content/plugins/super-forms/uploads/php/files/36744c8fc81d2c30e10c4a0e349f99d2/nabivofiz.pdf In PDF document text
    • http://caudafotografia.com/userfiles/files/34107523946.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16132814cc2eb2---37593757803.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/88201830524.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/21845567920.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/1212096440.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/rerumim.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/85988075752.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/molevukoxi.pdfIn PDF document text
    • http://recrute.fr/files/files/85004772827.pdfIn PDF document text
    • http://packturf.fr/files/gifikiziranagupodib.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/53447357353.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/fifamajegamesimetiful.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/guremum.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/zigomenagevub.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/d6c57964a489b468cb968bd2ca794297/rurofiribofufemozimufugub.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/megikogapi.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/lagix.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kirarane.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/10435273309.pdfIn PDF document text
    • http://104408017.linker.tw/files/levomipevusejasoso.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/tajujogezanizumok.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/28322494384.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/42114129519.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/17776265318.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=best+mission+game+for+androidPDF 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_off0000f772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF772 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F84 17136 bytes
SHA-256: 9858d32ee6e69f226406c5558556399a15d97b37de13394c76a71d0990c978ff
font_02_sfnt_off00013bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD6 10704 bytes
SHA-256: 610cd1f432f3373b4e3238fe79c799875ad879f9b5cc4db1bb2b4c5844d8f624