Malicious PDF — malware analysis report

Static analysis result for SHA-256 936c47e0cac0a965…

MALICIOUS

PDF

80.2 KB Created: 2021-09-13 02:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ac89c77b9164aa603f552d9dcc052bc9 SHA-1: 0888e97e7ffe002c6dbccebad843fb04db5dd44c SHA-256: 936c47e0cac0a9651010e583ef9569049dd9aaab94df0c60d8f1a8b280ea6cd8
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, characteristic of link farms used for SEO manipulation or to host malicious content. The document body is unreadable, but the heuristics strongly indicate a malicious intent related to directing users to external, potentially compromised, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://hagabb.ro/ckfinder/userfiles/files/12760162500.pdf In PDF document text
    • http://floral-design-lindgens.de/userfiles/file/teligarerogeli.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/jidakuliweleni.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/42291576281.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/rejuraxosekepilufujureji.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/61931634775.pdfIn PDF document text
    • https://atiksigorta.com/files/28685933688.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/kibigamogusufaxonimomit.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/49812507022.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/wuzinatiwepifiboxonuna.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/duxesufiraziv.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/38521837853.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7f6d18986---fisotizibijadidakinedev.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/6463257286db27c7292d4bcc018f7fc5/49631076213.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/nurajexazepugekavulugoba.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/ridefajinidun.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/51372e434a721dc5f155e43c4b492465/63407148280.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/dowutozawu.pdfIn PDF document text
    • http://shophouse.info/images/files/82238353158.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/5el2k56cn354chbubmgerkkg4m/nujorutugenazadibufu.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/rulosusujaxomop.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/18840908599.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/70125372538.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/81144437769.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/50965422494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=android+keyboard+function+keysPDF 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_off0000d0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F0 10852 bytes
SHA-256: 7479128cdfd5a8c5f4262e3ad62cb853f093c7a0f34f872ef081a736ac2c653c
font_01_sfnt_off0000ea32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10244 18720 bytes
SHA-256: 83a9fb6487572686623aa6f41649f2970cfbc57d6fd631daeb6bfc0c408cf656

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