Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9fb2609455ef578…

MALICIOUS

PDF

85.5 KB Created: 2021-08-16 23:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: a8b465374578e548142acb9633e44df5 SHA-1: d71991edc04ea29cc756090e8462a21c8a564741 SHA-256: c9fb2609455ef57811b6adf38a52a8aaa4d0d1b342f3821c1b5b0244c915721b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://walkercombsfamilyreunion.com/clients/d/df/dfd517ab040340b2551da60fba195f5f/File/33205461958.pdf In PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/fizalotaxurigifeku.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/getunutomog.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/028b9b4095e0040e76afff1981565503/tawasuvawamebo.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/foragipulixifutojenodod.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da7232e3c7---57785354334.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/dq6c9k6eium0gksvj6jidfkvb0/jolesebiwop.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/jawup.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e82005048---lizegadefupotufuvol.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/noxapukud.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/62994115468.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c3e675360---89286405707.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1dbb3b1851---71137341717.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/d0cd74bdc885a93ab003f2f22264791f/wiganezigu.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/30758271838.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/96557939601.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/rowavomegevaduzikubibibip.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/kowolawobuvamu.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161085c9c863d8---9662946877.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b753f6a853c---72168463667.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/futugiwiwasawosor.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/maputasigolunagu.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/durewufubadovamaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=jailbreak+auto+rob+guiPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13A 10336 bytes
SHA-256: c1ef9dc8021c98f26addb35902bb1e07bfc57062a77f95a56d537fb8fb5566d6
font_01_sfnt_off0000e8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AA 17608 bytes
SHA-256: 695d630765e9003928c46c27d88f971e6d2a53bbde8a6f539e1ae0162571e89e
font_02_sfnt_off00011613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11613 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E24 16632 bytes
SHA-256: 680e586a1ee573e661d30ea0f7a97a8805d5b79b2e3d5282e6cd27ea8e1e9edb