Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0dad8430cd01852…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 03:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 97baf2b9af530dfc698c3d40a7d74981 SHA-1: c68272617eb65a82496fbefcf42385e4c0f6d341 SHA-256: a0dad8430cd01852a7360d6bb79ff180b5c8bef330cee95f8d1c2778a5c3f1db
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of an embedded JavaScript stream further supports the likelihood of malicious activity, potentially for exploiting vulnerabilities or downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=pokemon+game+for+android PDF link annotation
    • http://nenkin-t.com/upload_img/ck/files/8578693778.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/99688730748.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/82226560913.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f26d523ba---92429742171.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/goxifosow.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/zapefidaponavu.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362a354cc6d---taposikaxuwomupenanipoxol.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/libunuxotozibafebopororuj.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/34471778441.pdfIn PDF document text
    • http://nscenter.cn/upload/files/wajemubelebovoxaramoloz.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613543cd043c7---4865272770.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/zofezumofilutozasotiv.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/sisos.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210917162326.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/wetoberewigatedoxikilega.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109180054025945.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/xiwijupalipopefulamamuso.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/84848909369.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/muxaxuguzajoxurebizovale.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/80850618271.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/14294547330.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/susisukigukuvujaxoxoset.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_off0000e521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE521 16928 bytes
SHA-256: 0911339933e6919c78429b57ea4b17095780642061bc6acdeed67a5ed0755691
font_01_sfnt_off000110da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F1 10480 bytes
SHA-256: 147c3d496db4cda25e93a84f0715952593dc444fca0f6758338196cb92056196

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