Malicious PDF — malware analysis report

Static analysis result for SHA-256 9970e0e22f5d235b…

MALICIOUS

PDF

83.7 KB Created: 2021-09-16 16:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6d701c1613393c01b81f1c2a7a0c2ba2 SHA-1: 2dd9bf48b2a1616b0da57da327866b4ef018a58a SHA-256: 9970e0e22f5d235b61fb373d612aa519862dbf790f8b1725df0fe2574dcceede
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various external URLs, some hosted on compromised CMS uploads. The presence of urgency language further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://abwwilson.com/uploads/files/966590820.pdf In PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/8269185452.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/tuxunovakalar.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/rujukuxuk.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/8b0s98oph703du793aek88q6j5/7889434349.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/34755526942.pdfIn PDF document text
    • https://seerupit.dk/assens/file/zatejogumokora.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/12805162046.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/71153029945.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/sejogufasebupob.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/wikavov.pdfIn PDF document text
    • https://tepihtrava.rs/files/buduvezuwejuzekaxe.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/4400642121.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/vufetasokubejipagix.pdfIn PDF document text
    • https://cinemaparadiso.site/uploads/files/lakamig.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143206ce8283---20011299911.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/1d10a41bcce6aa31319a003c24b26863/zavatajawezak.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/87991679079.pdfIn PDF document text
    • http://schturman.ru/files/files/pujorurufedevanes.pdfIn PDF document text
    • http://e-sportis.com/images/upload/kesujuturudasifilo.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/wiwowaketojeju.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/xonedikumuxoxulo.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/54305442904.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/liboxolumemejiboku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=8+ball+cheat+appPDF 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_off0000dd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD86 20224 bytes
SHA-256: 3bbdbcb316cbd649b36d4f95bd4d3bf49c7414202fbb835f0db40f3d7647d7f8
font_01_sfnt_off00011298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11298 10136 bytes
SHA-256: b74c1b24ccb54e34885a6fa2faefa9912a48267f58f11bc1fc5aff93b188e30d
font_02_sfnt_off0001292c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1