Malicious PDF — malware analysis report

Static analysis result for SHA-256 71890982ff40f74b…

MALICIOUS

PDF

74.8 KB Created: 2021-09-10 04:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dafe1c99c7fbf1da756bfa698d9bab66 SHA-1: d90de277233fdb1ef15249f3dc1e28aa9d26d36c SHA-256: 71890982ff40f74b69d35a803926dd0799abc84f790bbe1557c6e2c58830701f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://philabc.ru/uplcv?utm_term=watch+the+sopranos+season+1+episode+1+putlockers PDF link annotation
    • http://obasekiestates.com/UserFiles/file/bujulomovoxajedumolule.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/161354e6f39a77---godafafoxikero.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/63187175786.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/73141387350.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/32036236373.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/gewebexemefe.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/miteloxewa.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/80655850319.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/38406453640.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/8437942958.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/44947509524.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/33767829182.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/197769ab42dd9b69de6e7357bb06d799/lesixutanizikobisebofa.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133c6267a70d---88685443888.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/witazopegojawenigisidodog.pdfIn PDF document text
    • https://jss-moms.si/upload/File/79539284015.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/jasewigovefi.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/tuxaburidu.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/nukoxig.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/73951411082.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/0225f3939967ddc0f01cde69c6414b24/20793722821.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/1282188654.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/16282553191.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_off0000bfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C4 17044 bytes
SHA-256: 72b2bd6d6852005abb4445a18800ea8029377bab0c82dc13137be1b0331b42e3
font_02_sfnt_off00010407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10407 10848 bytes
SHA-256: bc39d54abfda926631158cfd89822655c747ba90315bfb7d3bf446a0ec44c385