Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16f87f7442b72ee…

MALICIOUS

PDF

72.3 KB Created: 2021-09-27 03:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 84d7f32acbb713a2740d7f86a5fe40ae SHA-1: 6bd84b5429ce1e1a1e60973b01d8d1feffd81a05 SHA-256: b16f87f7442b72eee4ac77d45bdd9f115b0c8f70ca6106d96944abfcaf3fa712
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, with numerous URLs pointing to external resources, some of which are hosted on compromised WordPress sites. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/68970941290.pdf In PDF document text
    • https://letstravelforacause.com/miet/assets/files/wiwufuxesogu.pdfIn PDF document text
    • https://fratellifurloni.it/file/dakaf.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/ranatulosofinib.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/55416609756.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/85062714315.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/7971196867.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/90548509783.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/darekitiwuki.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/745b89b79f6611d4f399a649f37e0d31/rosarujijexiwarapim.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/jutaloxafuturusidej.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/41126503435.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/lusuxobimesitefonavuxonir.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/rejumalomokelisuwogi.pdfIn PDF document text
    • http://boldogelet.hu/media/44612843802.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/63552220920.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/vunifi.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16141ffcfd83bc---tedafawazibuzowu.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/45340c310c8425fb84afbf45e58b7e00/43984475577.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/40113628369.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424eebe4409---rudovutinawudanab.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/81379414752.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b095d7d9ed---xarare.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613de80b9d481---81786205371.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/2d5beac720fef438cccb9fa37bff4635/puxijosunosubesukajeje.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/nopekexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=gta+san+andreas+cheats+pc+full+listPDF 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_off0000b6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A3 16792 bytes
SHA-256: 33454232bc53e18bc90cbe4dd50bf2ff8d8e37607274444297a4aa5ded357d2b
font_01_sfnt_off0000e296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE296 10736 bytes
SHA-256: ce3c3f8d4ff1c59c1bc7f8fa19fe688aabdbfc71c75450fe18e7d2059be5a1bc
font_02_sfnt_off0000fb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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