Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac3bd4dca51a1797…

MALICIOUS

PDF

80.6 KB Created: 2021-09-13 13:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c3c28db06657770701cef870cdd3cb02 SHA-1: 10c4afeefbcf5ee9cffc15c86af2d1fa40b9c69d SHA-256: ac3bd4dca51a1797a76e28706ec4d39798167172bc78fab8d2d7b1356946135a
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities and downloading secondary payloads. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to execute a malicious payload via the embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • 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://roomyab.ir/basefile/roomyabir/files/44584793366.pdf In PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/69096996301.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/73428759440.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/zeluturodobopuli.pdfIn PDF document text
    • https://best-label.com/upload/files/levugogugaweserom.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/b5a11494572a299b65af7984f6dcf82a/ravibixu.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/30444092650.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/p44goe31gui9g6gj1c96i0ab9i/felezuwewepoguxibutadob.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/devafatoruj.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/89788030550.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/xakoxexagogusub.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/84965308096.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/rebajiwotawupone.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/33511461611.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/70165696804.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/e68c09c4a8346e9b9d4f7e43046f16f5/sewasejeluvubowafo.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/07/livofevezusutejebuxusewuv.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/mavojopudenuduj.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/9242557855.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210905_013603.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613879b46cf20---nafomamu.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/jakevixulewekibatezezo.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210908184323.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/9957726959.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/27771202562.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/66863529049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=rom+type+of+memoryPDF 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_off0000dae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE3 16760 bytes
SHA-256: 6db3a30b6e68ef716eaa79db63b720632eb6b9568eff22c043235ccec49b830c
font_01_sfnt_off0001062c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062C 10104 bytes
SHA-256: f93ea154f1e6974bd6ae67fcf755039f15a8554ec3d60f081274a578a2dc36e7
font_02_sfnt_off00011cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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