Malicious PDF — malware analysis report

Static analysis result for SHA-256 598815af19f6b2ca…

MALICIOUS

PDF

87.9 KB Created: 2021-07-31 10:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aaa482fd7dbe07491dea5189755397f8 SHA-1: fa8dba22ece0356105705bc1d2a2ff1b198eeece SHA-256: 598815af19f6b2caaa386787349a7420d681b361b5ad84f815bc22670ada7c3c
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to distribute malware or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were extracted, the structure and URL findings point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.
  • 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 https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b101a00132b---gobaler.pdf
    • http://qunjl.com/userfiles/files/xinunen.pdf
    • https://planet-pvc.com/upload/files/37195754825.pdf
    • http://progfin.pl/userfiles/file/xegipusanitifuguv.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/fafd5jalatpm4kipqidkn3khv8/2462759855.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/puggjn5pih9o4730ranqffu38p/52260981412.pdf
    • https://oklogistic.lv/upload/file/5293411455.pdf
    • http://duoctruongxuan.vn/userfiles/image/file/65093410795.pdf
    • http://nickels.design/ckfinder/userfiles/files/83914208540.pdf
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/kiruvipisonukugasi.pdf
    • http://www.wiz-fac.com/uploadImg/file/lewimemasarutukilepo.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/82e46be36ce01a204301e84794de4930/38410613811.pdf
    • http://spencerrandlefamily.com/clients/864257/File/zofurufegosewi.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/b0d0a4bf323d29a5eead1e428040d68b/93937792067.pdf
    • http://ahlhy.com/uploads/file/010056247459.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2aa283c38---72548495462.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c491cf476---xiziferukite.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/e1a97d45814c8c1d19e6eddf802322eb/bizezirigixatekas.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fe28a61072a---loram.pdf
    • http://nmglyxx.com/userfiles/file/69519404507.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc0ad698d8e---zerutariwot.pdf
    • https://klcmekatronik.com/ckfinder/userfiles/files/nujup.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/1fhje4cflhdnkfq289o23554ml/newivawesidibisejam.pdf
    • http://lammensfilip.be/uploads/files/94551648018.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=dbz+tenkaichi+tag+team+mod+for+ppsspp
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e5.bin
0099b42365d04a6ba2e5a34a0872731bc155fb5fd7d16363d25838427bcfbfb0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E5 16620 bytes
font_01_sfnt_off00011e2c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2C 16792 bytes
font_02_sfnt_off00013643.bin
8c20c162d74ec09545921513081c40e3602498cbfa2c59649e61f366eb035fd5
pdf-font-stream PDF embedded font (sfnt) at offset 0x13643 11312 bytes