Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ee63fcf16ab170…

MALICIOUS

PDF

94.5 KB Created: 2021-09-02 08:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 267f93ab010a833b6c6dbc233e9d463a SHA-1: 6870875b6dcc677b748ef4241090158764676413 SHA-256: b7ee63fcf16ab170fe503fb5b7e6b1c6a87f30c0ed95f8a24d0bb0599c2f8736
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious sites. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, further supports the attack pattern of luring users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608007dba5570---73790322905.pdf In PDF document text
    • http://adaviestransportltd.com/userfiles/file/6818679400.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/podun.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/kerapuwale.pdfIn PDF document text
    • https://iranjobex.com/cache/fck_files/file/sakuragotinigivad.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/lixudutumirudufujew.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094098db803d---67678049812.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/82207592183.pdfIn PDF document text
    • http://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/56335463477.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/76961846437.pdfIn PDF document text
    • https://soechi.net/userfiles/file/26247597084.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/zunovoruvutijim.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/50049047795.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/97998831329.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab96bbd3549---betibeloxax.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/nlu5dqf1slp55pdo69sjipe4pm/31482041894.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/2abc81d03e8c535b87bd2420c868de38/42196530473.pdfIn PDF document text
    • http://omg.su/upload/File/feludafejeni.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/50615652678.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae96b84463e---19754051055.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/53258803358.pdfIn PDF document text
    • http://meechoktoolmart.com/user_img/files/pumuzodunavowe.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/jokizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=strong+points+job+interviewPDF 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_off00010a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A48 10716 bytes
SHA-256: d145c445411117bdd9b1c0b323937dc6e53231e5ee991e3f0dcf5410d72db10d
font_01_sfnt_off000122ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADC 18660 bytes
SHA-256: 545f3804377c359fe9262a8482cb1e98a2e32fef230841d37033a260f82386ce

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