Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e56d7a3750134fb…

MALICIOUS

PDF

83.0 KB Created: 2021-09-10 14:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a38842ceca3bac446d6a642b3ea7454e SHA-1: 531e3bd7706f60a953e9ee59cd50016a71a9b062 SHA-256: 8e56d7a3750134fb9884e54b34fd74c749e2a9308e8fdf148ee8d3da0f264202
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and contains multiple heuristics indicating it's a link farm. Several URLs point to compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ispartaorganizasyon.com/ckfinder/upload/files/34922032282.pdf In PDF document text
    • https://shen-su.eu/gfx/userfiles/files/fenilebetisuvowigo.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa09e9b011---totedozide.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/83306483648.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210905232533.pdfIn PDF document text
    • http://e-instar.com/userfiles/file/65611935796.pdfIn PDF document text
    • http://www.grifin.sk/files/pafuxonotot.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/23898557937.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16132c4547218b---4576980377.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/tonumazadenujaxumar.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/98393682839.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/782115948745d27566549aaa3eaac21c/kojejimawibadujixij.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/161303eec09cf0---fajonin.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/12351983153.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dojuroxul.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/1148419799.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304862eb3bd---2973762146.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f783b68152---63948133882.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/lamulapuloluvolijajasif.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/22511417877.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/7696335151.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/70887730190.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/nulamugumi.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/diludodudap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+earn+free+robux+2020PDF 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_off0000e033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE033 17548 bytes
SHA-256: ea58865361c68a80951ec44c98755631be8337e38876fd839fd199799d72c48c
font_01_sfnt_off00010dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCE 10564 bytes
SHA-256: ae9e62bdc197de7fddc0b358218f6184ad318bd827041972c35bd01c45b1f7a8
font_02_sfnt_off0001261b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1