Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b313b22aaa07b6…

MALICIOUS

PDF

98.5 KB Created: 2021-08-02 21:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fab403cc5db97099afb7cbe772ffa4f6 SHA-1: b9c028dba9e5f505d0f15c80887b93403d12b516 SHA-256: 42b313b22aaa07b6ecd770dfc425d7bf9c11fe5af11a00b73d15e9d595ca50ee
164 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://secohthailand.com/file_media/file_image/file/55966268995.pdf
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/918ebbb9f1903368985463b4afa35335/remoweduramaj.pdf
    • http://inezorviskids.com/clients/37546/File/47547519859.pdf
    • http://sakuragiramenandsushi.com/uploads/files/28445829812.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/s0jlll0aaok8pleflhf5i6m7t6/mamakofevesorovupej.pdf
    • https://ahreco.com/uploads/news_file/96788188799.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/689d8840b1579028de647c14af1b160b/96666950077.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097fc5dcab13---63259121948.pdf
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/soketun.pdf
    • http://slbreakingnews.com/ckfinder/userfiles/files/60760236344.pdf
    • https://franchise-vietnam.com/app/webroot/img/files/90198115538.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160de4ae3497b0---kolosuzonu.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b2a00d496---53129533327.pdf
    • http://alhouti.com/userfiles/file/wakironowufona.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983e3703a6e---71015111745.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/35d7a47968c56ee5b8130653cbdf9dc1/82838024977.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607dafdaa83ce---fuxikeneg.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa56240b1fc---55049197610.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/531b20d2d11511ae733b775818d91769/nowobovogifo.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b24b1c288be---rifozimupe.pdf
    • http://easyreturn.store/userfiles/file/bonugimew.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/c4b0637ed9eec3bda631dda8ad902d2e/8987463837.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/8hl42hs1qehggh9bc90gqtmhjk/70503594021.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ver+canales+online+en+vivo+gratis
    • 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_off00011c7e.bin
16b27c1ccc9cd728dc053bba23c42dc2e814d9ea5430d1beb61ccebccc5bac89
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7E 10440 bytes
font_01_sfnt_off0001344e.bin
a6a92419efd3ec2628718ab3fec1073a6e79bdcfa3a760cf88683d9e987c8fd2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1344E 17944 bytes
font_02_sfnt_off000161ca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x161CA 16792 bytes