Malicious PDF — malware analysis report

Static analysis result for SHA-256 957e41ad0151e28c…

MALICIOUS

PDF

69.2 KB Created: 2021-09-12 18:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ef128a78fd0f0488520448d7cda1cd33 SHA-1: 8c6cfb37829166701df0c1e27984e104af6abd1d SHA-256: 957e41ad0151e28cad424071dd73d32d8365797c72c6a9a8c4b847476575ac29
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links, a common tactic to deceive users. The numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggest an attempt to redirect users to malicious sites for credential harvesting or malware distribution. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://wastran.ru/uplcv?utm_term=samurai+defender+with+ninja+mod+apk PDF link annotation
    • http://theseadiaries.com/ckfinder/userfiles/files/36175713048.pdfIn PDF document text
    • http://changjiujz.com/uploads/files/202109051220114490.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/joraxum.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/zilaliwus.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c17ea514819a83eb036428b303a0b442/dogofopazuxuketeg.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/ludajajipoworalebupi.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/gawubatusovovefufevojafax.pdfIn PDF document text
    • http://sinoorchids.com/image/file/66511334688.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/fevomewodoxunifad.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ed11df2a7---23616540483.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/zojiselekolegawawe.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/lilis.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/95504099296.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/54830319007.pdfIn PDF document text
    • http://temple.mo/userfiles/file/xajolokifuvoxuwisemajemax.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/78288068514.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/16682704803.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/mepagoda.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/nafanogid.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a71a3e6f5---27027491781.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/36439394167.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/nekojozilunupij.pdfIn PDF document text
    • http://erex.hu/upload/file/xiwugumafoloxat.pdfIn PDF document text
    • http://hidramaco.com/files/files/bafowimovoko.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_off0000b1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F1 11032 bytes
SHA-256: 6a046a5b071bb1507d6a6d377a98de79909d14c0e10da4cd40da8cdc0a37e608
font_01_sfnt_off0000cb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6B 14304 bytes
SHA-256: 584066b69c4b98ed5aae746e041c1b3987ec3fc648340734ff498e132f7c7450
font_02_sfnt_off0000eec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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