Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb5a387a7fbb74ad…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 16:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5e1a1f9cd4c15e3433b4ee54932d7458 SHA-1: d2630c485d1aa30cf18583ffa513aa5f4eb662fb SHA-256: fb5a387a7fbb74ad1c3fc427d2b1c30bea48e2ee4bfb6dd65a0b48b856062850
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external links, some pointing to compromised WordPress upload directories, suggesting it functions as a link farm or phishing lure. The presence of a visual download button further supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://pixomot.ru/uplcv?utm_term=jihosoft+android+data+recovery+crack PDF link annotation
    • https://infotechsystemsonline.com/ital/www/img/file/12931688580.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/62753748083.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/zukenimabuvemuv.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16145c165aea45---vofomegenew.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/k1894q38i3afeh41vu9lgah2l6/32606592420.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/dd1vrg7s0c3tkalm7vj0if8ti7/93189006310.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/85781333420.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/nojasisisaziw.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/6100494678.pdfIn PDF document text
    • https://reha.bg/content/upload/file/dezaviruveluzibi.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/sisijulibolesuxiwimogena.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b669135258---1791482052.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/73058130638.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/lawanig.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/vezikivolelu.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/wemilegu.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16138df43efb6f---bisadufujawose.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/14252390099.pdfIn PDF document text
    • http://chinalabware.ru/d/files/58154920850.pdfIn PDF document text
    • https://foulardfotografando.it/file/xunekopotobudegedijik.pdfIn PDF document text
    • http://tecksco.com/upload/files/moraxalisorusu.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/87638991754.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/8833598499.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/dubiwumedabifexagewokexu.pdfIn PDF document text
    • 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_off0000d928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD928 10792 bytes
SHA-256: e5b2e156afdcd7eeb998b32afba053cc958529ed4c05c834c27bc5b93b9cc49e
font_01_sfnt_off0000f20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20D 18308 bytes
SHA-256: 6d04568dc035836c6e8e439b00b2de4ac858dcf8b1b7d1d13bc41664b7d62133
font_02_sfnt_off000121bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1