Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb38e0b5a1275ad…

MALICIOUS

PDF

86.4 KB Created: 2021-09-11 04:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b32ec3cbf4011456207b207ce1756d00 SHA-1: 8603c71ffaf3f7a55d8697909b4f7167eb21c26e SHA-256: 3cb38e0b5a1275ad9a71a2de6a75b7012980218b160fd4c4e2256e8e0e7562f8
176 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The document body was unreadable, but the presence of these links strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://businesslife.com/content/files/pupuxa.pdf In PDF document text
    • http://daeryuhealthcare.com/ckupload/files/58760596299.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/84379592589.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/faxuzojadolunisoduvufama.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613841d02611b---xubopejesib.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/lulajawibilusok.pdfIn PDF document text
    • http://anm-av.de/uploads/files/27295515349.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/be90a02f2558811b8384752a5be43f3e/80948789644.pdfIn PDF document text
    • https://tekartltd.com/upload/files/kovuzexukogiwotepozizafa.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/77654185849.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/mumimebaf.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/26506683009.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/p1k1h0qmqn0cnc7ci14keg41vk/wavomatizej.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/duwarem.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd588def3e---68259904526.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c00a4d89f---92841496577.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/13799574061.pdfIn PDF document text
    • http://gaudi.tw/upload/file/23763960965.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/runalo.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/buwodifivol.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/xurekuwo.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/wameko.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/98709622594.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/podupomebibenufedegidexu.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613580a45ef0c---vibefulusofafuxomuzotik.pdfPDF link annotation
    • https://winstar-tools.com/UserFiles/editor/file/78802646529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=redmi+note+10+pro+max+new+updatePDF 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_off0000e655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE655 10848 bytes
SHA-256: 8e3d3c8d28c086831357c2bed93181c007f29b6a5cf8db4bd0862c8a9cd4434c
font_01_sfnt_off0000ff6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11780 19960 bytes
SHA-256: 80a40985ed8af1c86b182eda743fecf631b4aee8914f4e17f622462b33edc13d