Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c70c09ebad9142c…

MALICIOUS

PDF

84.4 KB Created: 2021-09-03 08:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 14aabbbef986e09cd1913417c988f29b SHA-1: 312de92fe9a52af63bd2bd5fe9283bed0f611aec SHA-256: 8c70c09ebad9142c247967668f1d180b7bcd6045e6bc9844bc69b21b204fb2e3
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure and embedded URLs point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://fgosvo.ru/files/files/84762846891.pdf In PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/e4cf46041f946acb0a2e619e12464125/95670124556.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/bukujikonajokelopig.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e97b91a985---59056091213.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/mugekafujibuwusa.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/cc5f8f6a990752092f797c4683077187/gesutibirumosemalojamum.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118eb265c3ee---80918027989.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/13585014049.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbcdf07ff7---5149876180.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/13585533761.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/dazexikimom.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/90438876354.pdfIn PDF document text
    • https://grnca.org/img/files/files/86422959448.pdfIn PDF document text
    • https://amblamy.ee/upload/file/16874876414.pdfIn PDF document text
    • https://tckontrola.hr/files/84820382521.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/ba107f7b6ac90687fe5ac656ac3c52a7/tefaxewiwukep.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/0007147f5fde914e2ea63339fb35cc8d/90629193554.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/2376768769.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/68574703962.pdfIn PDF document text
    • https://moolans.com/uploads/files/getajidenilu.pdfIn PDF document text
    • http://falerisztika.hu/tmp/xudomajimi.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac941802fe---palaja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=qualitative+data+analysis+after+coding+pdfPDF 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_off0000e2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E4 18188 bytes
SHA-256: 0e599c545144284e917e5832e6cbecd5bc7ed6f5ffaa00f720d94ac795d9551b
font_01_sfnt_off0001117a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12991 11136 bytes
SHA-256: cab2db254b06259d4f4b0a4a95416490f126b5f44495b898ee47c4de8e8b60fd