Malicious PDF — malware analysis report

Static analysis result for SHA-256 5777e7c10228da9a…

MALICIOUS

PDF

90.6 KB Created: 2021-07-02 21:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f53e9348b7f2bf4e38b379e96666347c SHA-1: 7fa331c8b97299e839ccf957adcf9a4af54b0b48 SHA-256: 5777e7c10228da9a14a929bdd21bec9c36e62608edc7bdc83f24dd711bf96b56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's used to distribute further malicious content or phish users. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c34c787cb---55039573069.pdf
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/fifivatekob.pdf
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/84962116002.pdf
    • http://zetrade.cz/userfiles/file/51110861614.pdf
    • https://uclerbaklava.com/resources/file/warexepiminijugu.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b14f7145821---1753736542.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/5e227bd66520418fb45fa7547bb32ab6/67012233159.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/b3a0d9c9dca8056eadee192ebd35f6ca/lexipinaki.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e3fd33abe---libufix.pdf
    • http://nfc.soo.jp/file/92547210630.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/7feb19f2592e55db521e0aeec928a3c4/dovinosewunavomotuko.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/71036228536.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a647adbd188---81704243770.pdf
    • http://j-line.ca/fck_upload/file/48840235853.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/1ac7f07b6effaea13fbdd8090224dcd6/fipowimenokix.pdf
    • https://folklorebridge.eu/uploads/pictures/files/xibelugag.pdf
    • https://aakritidigitals.com/userfiles/files/64739097558.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/lu1spcg1k3nc9mbh8u5lig6d3a/kupegilenulunavaxorudaga.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/2nuagdhahrmh3ea4ep2k8ii7vn/bixamebonusoxevoko.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/737cecf18c9b11d67b748e4e2b080e38/22698030802.pdf
    • https://atamergranit.com/userfiles/file/vexaxitulebimo.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/9e34268e434c8351ca7ea3db5331f8a1/95107958397.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b51b4332e---karop.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=pandian+store+serial+today
    • 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_off0000fd83.bin
d95ac9707eced700e1aca9d82cd015c626a4c4c9d1d580fefd158659d02d5369
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD83 10356 bytes
font_01_sfnt_off00011509.bin
fe2f05139a4ee5b7fb581760fbe7d8ff41722d78f933e0dad2879daa363eae22
pdf-font-stream PDF embedded font (sfnt) at offset 0x11509 18400 bytes
font_02_sfnt_off00014534.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14534 16792 bytes