Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7871a8660988b8b…

MALICIOUS

PDF

77.7 KB Created: 2021-09-08 05:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2339bb99f297f69e36eb4240e813127a SHA-1: a8ea2bb44feb9a1ca32c05609920d5f265000edb SHA-256: b7871a8660988b8b46a0777144f135f7844fcc683d8f5954e8d335d2757d2894
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains a link farm pointing to multiple URLs, many of which appear to be hosted on compromised CMS upload directories, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076d5e1c70c6---fuzuf.pdf In PDF document text
    • http://legalinet.eu/userfiles/files/88811566325.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/73352073066.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2ff5ca5199---nagijimegexunija.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160dac30d53e83---65462209932.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/86496833788.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ad0758cdf---28605598042.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/10177807445.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/75423085340.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/jisow.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/fiwinunanumorajefuz.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2c4dd0b14---gefupekejodimesosuwuxovi.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210613142501.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160980ae09c9e7---manazakaduma.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160914c96dd891---lenoditubune.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/65110061100.pdfIn PDF document text
    • http://synhbio.com/upload/files/ranosatasavatofapo.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210515/file/16210258392577.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/supudesalelulegeboniniwi.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/hurvn19jqnh7pj6rkkeeqo3h2k/belodavuxijonaj.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/xexurebufo.pdfIn PDF document text
    • http://stolocatering.ca/clients/874514/File/dilariwasovidapax.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd2a68aeb6---wukoni.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/12818361225.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/29044407701.pdfIn PDF document text
    • http://ktcz.eu/files/files/29878812537.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/16206839833.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=mitsubishi+outlander+2016+user+manualPDF 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_off0000c9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B7 11208 bytes
SHA-256: 55e3921df85859fa64afa0a6fc0746fadf97993737fae3e3606a259d1db61043
font_02_sfnt_off0000fbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD3 17348 bytes
SHA-256: ac1b04fa1fdb226d5f47f238510e2fe82087c72606e547645edce95ff20b9f24