Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b49b02a71f0d8d9…

MALICIOUS

PDF

94.3 KB Created: 2021-09-01 12:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a92c92a51883bfbf50594bd8c8a67abe SHA-1: 50d55b7d659eb02aa4f74820f4e866949ad38a37 SHA-256: 3b49b02a71f0d8d9df3c55d7ffeb9077be4be8a7eeb7f8fab77a0be321351594
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites. The heuristic firings indicate that the PDF is designed to host a collection of links, likely intended to direct users to phishing sites or download further malicious content. No scripts were extracted, and the document body was unreadable, but the presence of multiple suspicious URLs strongly suggests a malicious intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2977

Heuristics 5

  • 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
  • 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://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072761e229ad---67594910254.pdf In PDF document text
    • https://adasms.fr/userfiles/file/lekuxozozivorusoru.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/57503663589.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076067e1ff1b---56793437811.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/54047733300.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/xexisora.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d67e566ae4---fenamigoxevu.pdfIn PDF document text
    • http://fygl.net/uploads/file/071802434102.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/k76kqq39isdpj5g7hbf513d4j4/21536513148.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/zoduga.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/5456080376.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/69467997483.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef2566dbb1---37646961402.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/tonogadorenixejijimuxad.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/zoninebuwira.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/88239545973.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/632004444.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/9a0876937a443a6be71448cbf7cceefd/23123299618.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/7a64a202f8470320e0ba5856e65f457f/62019689914.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/gewolexok.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/30030251089.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/79902626899.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/4dc4cd104bc02f562b89e0549af70604/89922266501.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/kuwixogekipobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=usedimplicitly+attribute+c%23PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE5 10812 bytes
SHA-256: c6b8c970924a0145cfd1d4afab550a10a82ebcdd6cad4209ddde1d22f52675e6
font_01_sfnt_off0001379e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379E 18684 bytes
SHA-256: b6a86939e7a1404e9fc02bd13359e1dfe42dca32f17859d23d73dba57963234e