Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3f5eaae5fce968…

MALICIOUS

PDF

95.6 KB Created: 2021-09-07 10:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41224958bc8374f5e13fdcdfe2a35ae9 SHA-1: dd639d05fb9ec5050e0a4932c1c9978ed7e20011 SHA-256: 3a3f5eaae5fce96849b473bc0421276803093e54293dd455a1b83e7c18dc42f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, but the presence of embedded URLs and the overall heuristic firings point towards a malicious intent to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://giaphatmed.com/upload/file/81973388888.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/71078f6971eb6e9ad6c6741877966e97/sogidinosin.pdf
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/891766f041847120aff63423d6079b76/81349927850.pdf
    • http://moonlightmontessori.com/upload/files/51894273674.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16090962c14d34---75274062755.pdf
    • http://zcapitalcrm.com/app/webroot/uploads/files/87665473840.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/75d5dc7aef1ec067667ee011ee5192d8/nugupajobuwemadiz.pdf
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mebevizaxodulufam.pdf
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/18935612949.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9707fc67cc---lufan.pdf
    • http://idcla.net/upload/files/votalexuk.pdf
    • https://aedwea.com/upload/foto/57213519680.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/93cab020d606626eda8ef701751554bb/19709208161.pdf
    • http://vietsaovang.com/uploads/userfiles/file/76360160638.pdf
    • https://ceccarbotosani.ro/userfiles/file/98325988393.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/938b665911b6682f815a9ef1f6a2e4ef/gukujafufugaxusokedupog.pdf
    • http://allaboutdowney.com/userimages/wupimumi.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/a35e48fff0c03576ff82fccab78cec82/ponofonujotufedog.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16088e47d95abd---38434417480.pdf
    • https://kemxoi.vn/app/webroot/files/images/pages/files/34472770321.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/zaxon.pdf
    • http://austral-immo.com/userfiles/files/gufaxobutikaguzojadado.pdf
    • https://atrax.hr/files/bibop.pdf
    • http://elyriacatholic1970.com/clients/7/79/79c6984f8945646ae1b55d50a6b4dbab/File/dukisow.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=xerox+phaser+3635mfp+service+manual+pdf
    • 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_off00010d72.bin
d3a701392d4e08694705f9bcd2cb0c2d26d14bda62fb7597692f08a64ed989c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D72 18068 bytes
font_01_sfnt_off00013c19.bin
6951f22d06252c9fd5d74b5b89a1f24f07e893a0ccc3b3f2d84f3d492049802d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C19 11536 bytes
font_02_sfnt_off00015745.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15745 16792 bytes