Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc6e21c853b2433…

MALICIOUS

PDF

66.7 KB Created: 2021-09-14 04:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f59afe6bd88e72b85496e9b857912c2c SHA-1: 37275b331de7f73e793c997bce6836ec8e6861b0 SHA-256: 7dc6e21c853b2433e304672c4718ca719e994433ccf9d5f782166da177a77eb5
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document is designed as a phishing lure, presenting an image-only interface to trick users into clicking a link. It contains embedded JavaScript, which is likely used to facilitate the redirection to malicious URLs. The document body is heavily obfuscated, but the heuristics indicate a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a campaign to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 8

  • 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 0 text block(s), carries a click-outward action, and is only 66 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.
  • 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 http://ets-sptk.ru/pic/file/64679251690.pdf In PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/bozarababijufijog.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/1316252939.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/38018204037.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/wutebakeretukoze.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/ramolezesuluvozipanupodet.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/52783884771.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/6584783384.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/eaf8c5bd786a981a2a59d4bf2c7f425f/68415056347.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/95718697915.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/32748130525.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/7309803358.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/86400156265.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/8a3f767b4f2ec9ae871eba2ef7d40b49/25860808224.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/bajemikosubusobi.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4f73d04a1---jigezebasozulutisal.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/93128130597.pdfIn PDF document text
    • http://arucax.am/user_images/file/levuteropax.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/tusebok.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/zolep.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/60993610218.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=hex+into+textPDF link annotation
    • 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_off0000aedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F3 9716 bytes
SHA-256: 7d16fe0fba8a4e7d3fcc10e1f8a14e0c07430202f2551382c5fb16285bae7e54
font_02_sfnt_off0000dc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC33 13576 bytes
SHA-256: 274af0ec8b51f184a053d94b3ef6d35bf8a01956d986ff733fc8ac53f9dcb674

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