Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd42cbf172797252…

MALICIOUS

PDF

88.8 KB Created: 2021-10-14 13:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f86338a204f2685f20658d373a09b8ed SHA-1: 555ebc7bd18662c75d5127dd18db042feddf7776 SHA-256: cd42cbf172797252fb4e409d1eeb3bf7d1b36199222391fd2cb208f5a9a825ba
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs pointing to compromised CMS uploads and disposable hosting. These heuristics, combined with ML and ClamAV detections, strongly indicate a malicious phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=scandalized+in+a+sentence PDF link annotation
    • http://ingore.cn/upload/files/juduvibo.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/345df89b2a0d1def4e2ed9c53e64dbd5/dajijado.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/kidozo.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/46829484053.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/43d825974360fd57ee1644977ec34570/botax.pdfIn PDF document text
    • https://limsurdua.com/contents/files/xufuwapubusinarumaj.pdfIn PDF document text
    • http://intersonik.eu/upload/files/pivajawukedabipan.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/4264090841.pdfIn PDF document text
    • http://dhf-china.com/d/files/zufebifemilikedebubasolek.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/93113918316.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/81997651600.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/92026288790.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/44035510384.pdfIn PDF document text
    • https://kokomanis.com/contents/files/rukujasu.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/60107671865.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/kuporagunirupumozog.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/rubapines.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20211007222757.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/57871111574.pdfIn PDF document text
    • http://soc-in.com/data/media/files/bunenefudajubifinixote.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/9ec13045eaa89b37483f508972a8d9e2/kejim.pdfIn PDF document text
    • http://fluorescent-training.com/file/bofuvatafotufajokek.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/vusexo.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/fixowewupakotovalixidepa.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/12560701470.pdfIn PDF document text
    • http://rsentco.com/upload/file/tobaxeris.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_off0000f4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F9 18696 bytes
SHA-256: f333e136bb6461c6bd942d4c6cef765ac5c9f0b189944c025ca1f2532eead126
font_01_sfnt_off000125fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FD 10276 bytes
SHA-256: 185616abd7d583c60b636464a9f706eb62e5e5219d11d85b9cf156bae57289b7
font_02_sfnt_off00013d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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