Malicious PDF — malware analysis report

Static analysis result for SHA-256 65e66107d8cfd9b7…

MALICIOUS

PDF

81.8 KB Created: 2021-09-01 23:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5b0525380043f5de6a34e3810c5b5958 SHA-1: 9c904d997cdc13b6156d018cd97fdd27f06febc3 SHA-256: 65e66107d8cfd9b7b39a5139a9ba76250064c6342dbff70bf4ac435294b7c5f7
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://maryalo.com/userData/board/file/pojefumitazetar.pdf In PDF document text
    • https://highrise.pl/file/97013905256.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/lopowolakobavixo.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/6bcb3922d5fa5d3e7598e6bdb0d93772/92860715769.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/26106368635.pdfIn PDF document text
    • http://jsdarvin.com/files/3181762440.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/fiberidi.pdfIn PDF document text
    • http://w-mill.jp/images/file/kunekabiduno.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073da035c2cb---90204437463.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/96e63a3f4b8dae00ae9e5dfe72252ac1/lawekalidadinebamurolujus.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/498fd3158ac2924b9fd9acb0880ef643/nojepiwuxisori.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/50573916322.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/2ktnd1e7fl8tj0gco02a8qejn4/24002218880.pdfIn PDF document text
    • http://mulherinscampground.com/clients/879992/File/13390137247.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fuvusefolawusukubu.pdfIn PDF document text
    • http://soflcops.com/clients/83267/File/49872716750.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/ektsb9r7thbnegr36jn0url9l2/xowutumu.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/9ae1d189b93c1e97f457f9c10c14ff12/89318012281.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac53d8eae8---73611983271.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog//file/jikekerabixofovikad.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094dae00772c---48756184656.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/62202696474.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/cc51272572f24984de8ea6edfbdd350c/lifexofigubapole.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607abeee89669---80599985995.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/sozuxuxiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=scabs+on+thighsPDF 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_off0000de91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE91 10444 bytes
SHA-256: 6f04c7d56467a44d7376961fd17d910dd0bb82c09c1324ad4d423c33b420c824
font_01_sfnt_off0000f636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF636 16744 bytes
SHA-256: 2fc03e479cd001056478b58e7fed1d61b28e04f0eba15cdea7bb9f7bd4aa9722
font_02_sfnt_off0001214c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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