Malicious PDF — malware analysis report

Static analysis result for SHA-256 d760d365fdbc4dff…

MALICIOUS

PDF

90.6 KB Created: 2021-08-25 03:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1a5b686ea20418a1accd449a54776f3b SHA-1: f6caecefc8244ec46efea554e06b567253345325 SHA-256: d760d365fdbc4dff54be18392df7ac135cc8e42afb909bf4886ecac4710313a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised CMS upload locations and disposable hosting sites. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection or exploit vulnerabilities, suggesting an attempt to lure users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://easyliveconstruction.com/ci/userfiles/files/37270721105.pdf In PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e67fb95b66e---12149226490.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210802044144.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4195123d78---54784494452.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/27720743260.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/tofan.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/mpl7sl3o7mmq6nl65t97p54duh/51446052527.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c771205a70---1006605586.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8c3ea4a66---lazuninasunoxar.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/livaxovotifibon.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/38a0a016e24d92bd95bc4820ecc99d4a/56159558604.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b70d93aeb6a---82102099297.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/57019929303.pdfIn PDF document text
    • https://tessuno.com/upload/files/6119ac5f2041c.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/17695115689.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/t5p9g3a6edafbaol9ns56hqir2/84065638573.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/25704716832.pdfIn PDF document text
    • http://chamdure.com/DATA/files/78863301292.pdfIn PDF document text
    • https://bojovicsirogojno.com//files/81925809943.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/gigasinixego.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1608d908d42c4b---xegogifagekujateg.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/vebixaraziwedubimuluk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=missouri+boaters+test+answersPDF 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_off0000fd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD15 10376 bytes
SHA-256: d5082038eeecfc8045c1ea4f3617c2def712400bdd3169f11a88d1e21ea740e4
font_01_sfnt_off000114cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDE 17832 bytes
SHA-256: aea81614f6bd47a0191922efdd4d145d7cad19fefd5de15bfb5eb5d692e73596

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