Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc2c3fdf98f4586…

MALICIOUS

PDF

83.4 KB Created: 2021-09-22 16:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8fcc3dfac140ba78a9b0375b0c5b3eb9 SHA-1: b062eb2a9fd622119bf54f765a7ef91c09547362 SHA-256: 5fc2c3fdf98f45861f7d30f13e095b946040a2982e0b3dae86eff3270005618d
164 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm and potentially malicious, with a high ML score and ClamAV detection. The presence of a download button lure suggests an attempt to trick the user into downloading further malicious content. While no scripts were directly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161460b51e2f09---79955994852.pdf In PDF document text
    • https://sportcity.bg/webroot/img/content/files/viferetejokumaluxusageji.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/66937695554.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/bojogawovukelejefuteromun.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/4433444871.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/299752903.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/28137214536.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/gabikumuzesejuxadepod.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/95224778038.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134774d979de---mufefadovevenopomofexe.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/35171826578.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4160884ba0509759a77806d0a03577c1/xifegajoduletajeri.pdfIn PDF document text
    • http://riversedgefm.com/files/file/72185900137.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614024eadcab8---wadigojudug.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/18452783396.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/desejen.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/91706955222.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/kokatujalegawan.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/tataworufo.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/wefomatom.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/46029347118.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/fomejuxitojorikisajerixi.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/kiloworasituvul.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/8858663415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=mod+for+sniper+3dPDF 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_off0000dbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB4 20204 bytes
SHA-256: 6bbfdbd07c77ec04384ec11e9d7767d2639172465757d0355ad6fa819d0fca88
font_01_sfnt_off0001106d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106D 10348 bytes
SHA-256: 94bfec0e782dc8623897f5f155ecf403d0d0d745ccab5d335c6ba68ab190c24c
font_02_sfnt_off000127e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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