Malicious PDF — malware analysis report

Static analysis result for SHA-256 7018e6d74f2e09c8…

MALICIOUS

PDF

82.7 KB Created: 2021-09-13 02:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 33ed044548d8bb5b44a521a3543b703f SHA-1: f079ceed3e7f2f8995fcaeca80d8144178486b8c SHA-256: 7018e6d74f2e09c89d3f25fcc99117d3821191058e6d7ce68204133c9dbaaa2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous external URIs and link farms pointing to various domains, many of which appear to be compromised or disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://infrive.ru/uplcv?utm_term=recovery+mode+moto PDF link annotation
    • http://stin-verdon.fr/assets/Image/files/lewixatiwamesezol.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/e429ba38cc86618000d69eed9abfdcd0/turenumakefunudu.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/4426049195.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/wibabub.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/34919509476.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/fazenuvutazubemufedodu.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/48428650334.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210905225234515893es4mgp.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/87071133595.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/dn7drk0isfq2n99l5rqdlnkmgp/kodugosunekorifukew.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/datuwogozuzezatetakor.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/zivomamaja.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/rexetoro.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/musetukimexadilazeje.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/83274547939.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/78014496997.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16135a33d124c3---sipedijipevimakubagisov.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2075e93cf---12154902340.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/18499471784.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/30230655781.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/95141854202.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/gasetawasoxadux.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/32717579524.pdfIn PDF document text
    • http://artio.pl/files/files/51751253535.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_off0000df84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF84 10184 bytes
SHA-256: 5b7ffa3babf81f8bf22c7cd630dbc3541a02d1a58fc35ef351db7dde8f95ee65
font_01_sfnt_off0000f660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 18016 bytes
SHA-256: c38b593e237c16c8b8271fdbc74468583acefe9c25e1ea2af874118b54d4aee7
font_02_sfnt_off0001250d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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