Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec90fedeee9a0fe…

MALICIOUS

PDF

81.6 KB Created: 2021-09-12 23:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf2a3b94900143aadb89818abbed79ec SHA-1: f36afbe26aeb6d540bc11fc06ceae23138044e40 SHA-256: 3ec90fedeee9a0fe0a3b5483cada6834a2e0f4b6cc223c648b65cb80889356bb
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of embedded JavaScript, though not directly executed in this static analysis, is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://greenbins.ca/ckfinder/userfiles/files/98474678542.pdf
    • http://seritour.com/rsm/files/sijuvifodowuwetas.pdf
    • https://arichaindia.com/userfiles/file/98256058856.pdf
    • http://cathugo-yachts.de/res/wysiwyg/file/50250133481.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161331cec6e4b4---kabuwabujafinekofokodir.pdf
    • http://banglenhospital.com/UserFiles/File/7242784160.pdf
    • http://vietdubai.com/userfiles/file/82346776641.pdf
    • http://greatwalledmond.com/ckfinder/userfiles/files/diniropuz.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161348b39719e0---43571643269.pdf
    • http://giasudaihocsupham.com/Images_upload/files/zugupojapexukalanemo.pdf
    • http://nextlab-semi.com/files/fckeditor/file/70476690751.pdf
    • http://impactpluslearning.com/ckfinder/userfiles/files/kopevajulisapi.pdf
    • http://caudafotografia.com/userfiles/files/xilifuluxukuvisim.pdf
    • https://lotteppta.net/beta/assets/file/15604838439.pdf
    • http://tipkeo.com/js/ckfinder/userfiles/files/gabebojofonu.pdf
    • https://mayphotocopydogia.com/upload/files/91199611435.pdf
    • https://ochronaskory.pl/pliki_user/File/88730990895.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c848c2b953---82667737736.pdf
    • http://teplorium.su/userfiles/file/mivaxeritaven.pdf
    • http://sevenseahotel.com/uploads/images/files/15489260318.pdf
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/lidevefukamu.pdf
    • http://hasyo.net/files/file/jonumipelumejorexefif.pdf
    • http://iweldbot.com/ckfinder/pho/files/93048202168.pdf
    • http://arhive.np-sp.ru/img/file/48445215769.pdf
    • http://bigcool.net/webroot/img/files/forasopuparewotesugifam.pdf
    • https://derey.nl/app/webroot/files/userfiles/files/86991388154.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+use+qr+code+on+iphone+11
    • 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_off0000d9f1.bin
7397d2ee7c0705794550acf7ab229cf259d57b6520b0831734cd1d38a2b7fe08
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F1 10780 bytes
font_01_sfnt_off0000f28c.bin
6354819b788a9e31308eed1be8e484e9c7ddc2d5a01936e119d81f876292e8d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 17776 bytes
font_02_sfnt_off00012089.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12089 16792 bytes