Malicious PDF — malware analysis report

Static analysis result for SHA-256 1123443c580114af…

MALICIOUS

PDF

75.6 KB Created: 2021-09-04 22:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dac8573a038269b3386eb7f8a74af686 SHA-1: e924ae88f8da65e990b68e0f90e1708d27376233 SHA-256: 1123443c580114af1cd3043b51d35a51fbbc57d86e0eb315c260daa9db842f6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URI links and the nature of the URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=tenias+que+ser+tu+libro+pdf+gratis PDF link annotation
    • http://bahtiyardishekimi.com/fckfiles/file/19230689353.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087ee932639a---neluvasozifiradikonina.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/takilasedodu.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/97814549401.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/59f4e466b56a0027e0f78b7cd4b8dac3/76313565836.pdfIn PDF document text
    • https://resicolor.com/upload/files/65756260006.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/nezamojus.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/870419b52496ea4c8da924ed1c8c49dc/79180321849.pdfIn PDF document text
    • http://merwepizza.com/upload/file/89995106641.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/17519713595.pdfIn PDF document text
    • http://preiss.at/upload_files/files/47717371184.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/a7b723efdfd494b66cebef4fc628cbbe/97955951575.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad343176483---dawamotamovifuji.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/eb2e94ef3d894118b86282d0a9f297f9/sinebisisateponotuwafi.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/38716916797.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/33455331910.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/b6fa057b40de11446e7cb682c63c1c6e/rawofedu.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/1aacdd69955af5d54f20774ca2752bd9/vivifajuwoxinetixomigux.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/i5ovgngh6rb8to8l77gathptfb/watutifajubedozuvirago.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210519162139244215.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/xiwonikujuregiloxe.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0e2e6d250---vewusumugeputizoparidaku.pdfIn PDF document text
    • http://topstec.com/d/files/74047282767.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/tafope.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_off0000bbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBEB 20164 bytes
SHA-256: 15094ecc332969f2250f813e24d13dd03216c94b4ac78358cca6ce094f06c33a
font_01_sfnt_off0000efbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBB 11020 bytes
SHA-256: c15c19ba72a68b678ba2a5b992f46bdeb56a3f3729b68da284d72353966d8af6
font_02_sfnt_off000108be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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