Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe81fae1085799cc…

MALICIOUS

PDF

76.3 KB Created: 2021-09-24 05:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4d9c2c3aa7d11651ad1b2e6039f88c9f SHA-1: 1abcd537302e45a71b7e32e6885b43fe0db52b02 SHA-256: fe81fae1085799ccd76feb6b2a245542bdf5ff97283fd908d10d1d242a656840
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and ML classifier indicated high maliciousness. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, aiming to redirect users. The embedded URLs and link farm structure suggest an attempt to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://huyminhplastic.com/upload/files/54181641544.pdf In PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/44341194244.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614606619d74e---28749142374.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/80384969749.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdbe6a358a---pelisu.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/68190640956.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/011245402883.pdfIn PDF document text
    • https://superchills.com/userfiles/file/3158419834.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614b34d923f85---pilelude.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/65222167896.pdfIn PDF document text
    • http://cy2hand.com/userfiles/vunawubarojeda.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/xuvupivotipaki.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xawutubutanelorama.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/vitukibi.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b61bea8e56---vuvoveriwovimanafip.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bivinimojolepuxigexoborew.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/difexubilananixebij.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/38217088855.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/88180194368.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/deparesotowapixiperopav.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/tiginalebe.pdfIn PDF document text
    • http://webbuilders.com/files/file/jovexejezaxulawude.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/59737101418.pdfIn PDF document text
    • https://sokole-tps.pl/userfiles/file/69246827730.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/ea70b230010ebdd93f4ba79a41324578/7519274677.pdfIn PDF document text
    • http://chapelguild.com/images/usr/sesibapuvula.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/bumejiwudixamexageleri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=install+unknown+apps+android+tvPDF 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_off0000c8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EE 16308 bytes
SHA-256: 2898377caecba9a6637416ceaaa93bd10e7b057f69971e8d3281b52cc8d0ce11
font_02_sfnt_off00010adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADF 10548 bytes
SHA-256: d2da252c507a441304dc20b5600f3c87a709fa3231a4992e93d50807028c1ecd

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