Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8b8c380693be8e…

MALICIOUS

PDF

87.0 KB Created: 2021-06-30 07:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6f4eb2c9e1959103f7af2732cbabd47b SHA-1: 18bed43af2f37d684fbbc11d61ac91ce8193ed06 SHA-256: dd8b8c380693be8e3fe8422f635d1b9442c6a07c5152a77b98971630dc7ae2cc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised or disposable hosting domains. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://easykart.store/userfiles/file/23618512613.pdf In PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/0f134083702ccaa00b82f2f57f328ef9/mesokurulokar.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd27f647754---netinulu.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/53d94824c07ee9b4cc411eb6624b440b/watezexiwomewe.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/risunerux.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/8ngh8gsm1r3e1884350kd3gr1k/zogor.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/28378738669.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/74ee7722f99b164314aa1d6dad872749/19365265779.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/wifetebeforoxijobavotiv.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e477d478---vowifoviw.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/94355640745.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985e64d550b---raxezogaja.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ffaba4986---7016611613.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160c51e59c8ba2---xesazisiduwofekudisik.pdfIn PDF document text
    • http://jarosi.hu/files/file/diwenimupujubopowidulel.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d53c4d50c26---24972058022.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/05390065078bd7e5fe4cecbc93a952b6/59541867551.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/26124571842.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/valatopudatovuzazavu.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/1cb028bc8546d0daf1526c58c7208917/sopinafunowiko.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/xuvimezadekiwol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=distributive+property+of+multiplication+of+rational+numbersPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10788 11064 bytes
SHA-256: 46dc0e8f036b34379092514fc1e4ac742cfb56aa773180df1f5e4d71ccb2cf5b
font_02_sfnt_off0001212a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212A 17336 bytes
SHA-256: 1efb411935e1be4e253de91493903c9b74c545c22a63f5d610c1cd925ae6b149

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