Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b8f94d16edcad8…

MALICIOUS

PDF

84.2 KB Created: 2021-09-05 10:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b9ef1e982c39221819ad53c9539c94d2 SHA-1: 1df51b0a7527e16853b2d8a524a25e75879703e5 SHA-256: d9b8f94d16edcad846193f781b7cf6191aab30a4a0622fd41f9b9ec24c45d1ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=pdf+compare+online+tool PDF link annotation
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c95ec8a21b---sopotosopuso.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/23149728261.pdfIn PDF document text
    • http://scarpatti.com/files/19063463716.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/tenaladitavugumefepoli.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606d465eef56e---65840164386.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/marelu.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/39841949659.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xamawawir.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a09b90d6bb1---17554548188.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/90324625921.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/bafivazaganebodasoja.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/e0kg0ll32j3qkhshmd43tuij34/tasalekaxinabipijenovu.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/xifol.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/61128325720.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/6dbfc960700ebdcf075d55c5357b1a7d/xojosejuxu.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/23373647949.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210725002233_0wr1j7.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/83043836025.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/b4af8cf9ce200fdfc11e2dbf30edb247/58821482656.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a96e74514---47143474181.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210506040615.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/19678929488.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/ramupa.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/jujuraxotediwazujameme.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/zorupewesow.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_off0000e40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1D 18040 bytes
SHA-256: a10a2ccb19c7b0560f3cdf5288829598a3b8fcc401a01ad856eef20b3076c2c9
font_02_sfnt_off00012ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADA 10616 bytes
SHA-256: 96af56e9c3e1832beab37ed8695b0aa4085b462ab7c38da0ca4537e95d540ba8

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