Malicious PDF — malware analysis report

Static analysis result for SHA-256 8932c7ea1524ae10…

MALICIOUS

PDF

80.6 KB Created: 2021-09-14 16:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7bcd3f6e083d9f0c97836a068fcc386b SHA-1: 6985b7f1a2d925aae518ded230ed4e166b96c849 SHA-256: 8932c7ea1524ae10d9f9aba624dc8b08cfcc176d6b4ee7916494cd259ab4f02d
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to other PDF files, many hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://simoncaulkin.com/images/8165127431.pdf In PDF document text
    • http://chickenwild.com/upload/contents/images/images/nolulevixu.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/wasajabamoxumumadopiko.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/c17bd7646a3a083014f44ecef6782cc3/47277970986.pdfIn PDF document text
    • http://rem-proekt.com/f/file/latebobanabavaf.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/kifinoteg.pdfIn PDF document text
    • https://basisnomor.com/contents/files/befowapikaduwemuzexosit.pdfIn PDF document text
    • http://becucci.it/userfiles/files/mujalaterixuwonufa.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/zapafemazejawopi.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/67ff8dc3186f01418cd21e886109c19b/32454440338.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/55977100993.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/vupufakuzuvufakukizeno.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/lapusavidemegamidezu.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/zigasoxufisusokezeg.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/zuserisegavup.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/xusulaserod.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/63653940274.pdfIn PDF document text
    • http://3q1p.com/upload/file/21091322125764850120pa2la3yxe9.pdfIn PDF document text
    • http://schokofontaenen.de/idata/pirapugurujuz.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090812583860.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/40012820050.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/70600561415.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa877637a6---14574115587.pdfIn PDF document text
    • http://thecuriosityshot.com/16591347821.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210904_9805AC2105C34494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=vidmate+app+old+version+2016PDF 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_off0000d61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE31 11052 bytes
SHA-256: 6cef1a2656fb2d579a135be7aaf42f331c8c8cfadb3c004feb66e0f7f9d0f07b
font_02_sfnt_off000107f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F4 17356 bytes
SHA-256: 55c2a426d5b78b65ba09c8f949eb9f1bb007a57a9f185bf1703afed5a755c023