Malicious PDF — malware analysis report

Static analysis result for SHA-256 1929ffdf372aaa93…

MALICIOUS

PDF

80.2 KB Created: 2021-09-11 15:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 444e7b41450ecdf555ed0107a9a13d5f SHA-1: 065e3e674d4ec33aa9e46aa68a8f7e9a151f24af SHA-256: 1929ffdf372aaa937f3be1e7696c3b9c635bf20267b6e35b4ee287d66dcfd0c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and other disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is designed to obscure its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134687c3b88d---49538323081.pdf In PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/161311465aedd4---92354024279.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/51964331682.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/pokipotamofagewogodixun.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/242066413.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/68993957526.pdfIn PDF document text
    • http://platcometals.com/images/file/20690781856.pdfIn PDF document text
    • https://premiersuli.hu/files/files/61946478714.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/sejarumaburiwojiboviji.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/gawabuwaruma.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/vonek.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/pikilifer.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/17753318877.pdfIn PDF document text
    • https://robodom.si/files_vsebine/sexubilat.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109090821594934.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/ziliraduworixopegejo.pdfIn PDF document text
    • http://amirmazandaranihospital.com/ckeditor/files/files/45381590372.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/82093597448.pdfIn PDF document text
    • http://dsagco.com/Upload/file/wefosimugudanarosur.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/nojufofilag.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/sudebowew.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/79595825625.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/peletenipilun.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/0db9b813d1f115b863b1991b6271e763/bunujiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=jester+virtual+apkPDF 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_off0000d5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AC 10272 bytes
SHA-256: e8b19e1dc0e0204ad793cafc5a1c81636f14d1da0839aa2463c471f6f4fd648a
font_01_sfnt_off0000ecee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEE 17936 bytes
SHA-256: b575e7ce7895719da73b3b105e571e07d499ecdcd9420d11edc1fa10121df3b2
font_02_sfnt_off00011b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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