Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d5f1a2a9cd954e…

MALICIOUS

PDF

85.5 KB Created: 2021-09-13 16:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 30f551eb3a01dd273cb1f6fe46eebfe7 SHA-1: 4d6372677761c303e9c54e8347692d3a60826e87 SHA-256: 40d5f1a2a9cd954efa6b29755125764f4d0a4c926f8698f6fc3da45812646438
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=superimpose+app+free+android PDF link annotation
    • https://readandenjoy.ae/userfiles/files/wotesipumurajudizonafebo.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a25e881ba---79627950782.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/53963129294.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/jiwutinijeribolebawixe.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/lofoliloxidemavati.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a912ce954---63454740811.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/bujaloveduwixuloganapab.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/sodusepasofepuromagogi.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/pigubafaradipapori.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/kibadebaxi.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/luzikuril.pdfIn PDF document text
    • http://shophouse.info/images/files/82238353158.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e885282ce---38064878346.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/gefenuvofimekikes.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b59c195d16---37306727590.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/51189194160.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/febezomulujepiwixowo.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/95312206986.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/dajug.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/kivurapanagapixuka.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/20167766274.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/kojul.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/92281178452.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/werilivupomimomowukod.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_off0000e90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001011e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011E 18056 bytes
SHA-256: 010ab80c89b9d2f81fb225132c79c52ac118ba9b4ffcc9fa460822b1dbca5173
font_02_sfnt_off00012ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFE 10688 bytes
SHA-256: 5724dd911c4e4b006497967e7a445b555347f9c0101590e777a7f69f5962c289

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