Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f7bc12734d29986…

MALICIOUS

PDF

162.1 KB Created: 2021-08-02 02:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: accb2cdf7568f9685d93e24919b6326b SHA-1: df1532bafe67d3bcd1ab028cc0a9e750cb0d0676 SHA-256: 7f7bc12734d299863764a7070ecd2ef2636a06376c771902b95bd090fc222aa1
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9706

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160989e4adf4f0---32331086106.pdf In PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/1930e1534709fa3d6de82b9669f9dcaf/zubotenomatit.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/kanekejosuja.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609edc49e5616---30080151952.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c652011979d---mejolanijorotopozi.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/86738014011.pdfIn PDF document text
    • https://campermagazine.tv/public/file/44734272295.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/najawubazibivo.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c369d1e067d---49857824543.pdfIn PDF document text
    • https://synersys.fr/contenu/file/laxowufugew.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608116c030b2d---64900393747.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/8e3684d0eda123b768d72722794afa04/sololosewagukuxefejeduz.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/nigibezikadi.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/39582800444.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c577c34cd52---61304040479.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/58741766954.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/3959755169.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/10862734992.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/tofuzusaxagumekomekate.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cb469245at8rm169hsa28gq0j4/91855269363.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afcd167246e---xizofuvisuwilinumu.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/9f37e6ba10833a0c05664b3e6805d0b2/51372487926.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/ea2765ca52e126978f5fad0895af7568/jadafudelu.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/fuzup.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857bca499ce---jewegigo.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/ecf7e8274f78c1e3f4151b4ce2667884/fipazutegapafabube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+install+bodyslide+and+outfit+studio+skyrimPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000209b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x209B5 2372 bytes
SHA-256: ef93fe43a9f5f4c2d787daf650c5821b0f266b4216228a2d71b61dd19a2520ea
font_01_sfnt_off000213ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x213EE 11040 bytes
SHA-256: 7cb0421159f991bd1bc37e8bb63dc173ebb1f8f08f93e660e50e5a04f6fb8d56
font_02_sfnt_off00022da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22DA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000245b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x245B9 20024 bytes
SHA-256: d0e41deb70d439a9f6ed8f9c79f932f14fcbb2451f0ac40d32566bdd13f5dc81

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