Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b703f251df7dbd2…

MALICIOUS

PDF

87.0 KB Created: 2021-07-03 13:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7633f9e807762ad5c730e65a140d1672 SHA-1: 35084958220aa6db90ba6e039f730ab08b3425f5 SHA-256: 8b703f251df7dbd217234c09e0f29c189128f143f6d0a02774537105e8832d28
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised CMS upload storage or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://apexnepaltravel.com/userfiles/file/46435264352.pdf In PDF document text
    • https://actorconseil.com/files/file/44125304355.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/kexigigi.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776958b446e---19633829426.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f98faada4---jokimopezeruvovanodazomo.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/10808421175.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/xebetugopiwimigizeri.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab939d08c7f---72155740056.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/7508ffa62357651534d66d15c6503228/nevojagubavuxumedukul.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/lowebe.pdfIn PDF document text
    • http://mtntoproyalshihtzus.com/clients/4/42/42f4769cb4f2467af64fea76c5682520/File/gibusoxil.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/delubezewezotij.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37b84022f4---29786316648.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/19207252984.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/i1k31a2k0vkaeueh54dge9qoq9/zikavalamemana.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/39049529724.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/22255529200.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/fesolatefowerig.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57e90963e0---kedisodesotozenizik.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/tabpchjeblj8ht3sckdbqthlfc/lamuvidamexuzinanepopavi.pdfIn PDF document text
    • http://fpsh1980.com/clients/7/7d/7de5299bd6bdc19cdd6b275c058e9c4a/File/temiwugawagak.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/jovodotolenudubanuv.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/34278512931.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/udpe4pufuullvma4vn4f8u4l0p/pujinapigukewuvininizut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=word+for+family+orientedPDF 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_off0000f0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F8 17652 bytes
SHA-256: cc432c8d6eb0cf4bf574e5be9da38937600ed003da01750a481b90d1d7ca0333
font_01_sfnt_off00011f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0F 10452 bytes
SHA-256: 6e1d2fce55a437882def9f1ace0df4f6d7ec7d4af48d2ed74895955fdd4184db
font_02_sfnt_off000136c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1