Malicious PDF — malware analysis report

Static analysis result for SHA-256 d551391c5ae00e07…

MALICIOUS

PDF

80.0 KB Created: 2021-09-06 08:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e5898f57fc882e3f23e27010383cad14 SHA-1: 31085a1ae3f9ab2e508883b4a7244633ac2591a4 SHA-256: d551391c5ae00e07e4bc50166b3de2fc8c63b233360943e60463f92e69e0644c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting. These links are likely designed to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://synerhu.ru/uplcv?utm_term=ruckus+zd+1200+manual PDF link annotation
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/6uaane8nd5kfi9gim9c8mqc6d2/zamigeke.pdfIn PDF document text
    • http://iwnta.com/userfiles/file/56036620582.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/77557260735.pdfIn PDF document text
    • http://caramelitos.sk/files/39808305447.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c8325e143---83851731734.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/sapibexa.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/mozugofozaxuva.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/545e8c5001d229159d7540697103fa92/37988936663.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/39824710848.pdfIn PDF document text
    • http://chromatographvials.com/d/files/foripuk.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/56612546868.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083cc65845c3---menofo.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/refezu.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/5036568076.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/bisukuluwegobotijem.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/496f0f3f69e6ed068fbbc0811e60d6e3/gevuxazigokavapunepax.pdfIn PDF document text
    • http://arablift.net/userfiles/file/67961184022.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/mofefivafovawakinizu.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/torosujupenipudomojav.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/takejumabitotitu.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/44381473784.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210616_B18D3FD15677AA8C.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/83317019147.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/51177896113.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/6104468339.pdfIn PDF document text
    • 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_off0000cfb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C5 19620 bytes
SHA-256: d7ab1fe8e54b82686ac10ce76b8fa3ae43ee1f55214dd42b71a26e072c0e2572
font_02_sfnt_off00011aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA9 10580 bytes
SHA-256: 9d336ec33d9e7ef3e388597bf05602f5192b17bd2190286a1b930b2d2a8bba96

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