Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f994aad1797085…

MALICIOUS

PDF

86.3 KB Created: 2021-07-13 21:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 538d46ec2f4c3cd08863bb0976b86633 SHA-1: 30b96ea61ac580751f7b873ecb085d85080a0f27 SHA-256: f4f994aad179708562f08ae007af8f5a2ac6e6fe8ff76df035e7cd305d1e7877
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF document body was unreadable, but the presence of numerous embedded URLs strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/285df4e987cf4acdabae634cc1b0bb15/xijavepuxogokuxigudabef.pdf In PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210622_113116DE4648090E.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/61tr39kh0e09vep66rs6nv7s64/63007301848.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/84275389362.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/56566189782.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/99993944340.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a704f079f9d---97486189376.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/d6098940c548a35c1e4ae0fd3d4a3cd5/retunojagusenewogot.pdfIn PDF document text
    • http://shhs69reunions.com/clients/e/e9/e92da0bc0099326815942f81a5c18dfc/File/12656908724.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/19858407253.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/d1563f82e31e0ee756af64d3426ae9a4/11478127199.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608833e3157bf---99912030704.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/pojv9cht4g5uk9n6ra8ee0lfm4/pipuwijiboferovage.pdfIn PDF document text
    • https://paperland.bg/uploads/file/4126750873.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/4qjgs4pcd68m8pdsbh21s4oo74/44744319322.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/kavixosekovebijinikipi.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c997c76622---89340465516.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d020b8b52e2---16738754646.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ce229b5b750---42431615135.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b7c89b329---42565601784.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/03687a7179cff58dab530e51f09fd49e/76131414567.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/tederakogilutulunodakibaz.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/82146535193.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/kaniwobejegomabuzifavone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=chocolate+island+2+all+exitsPDF 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_off0000ee87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE87 17332 bytes
SHA-256: a3c3e04006e1f04840cd5b269ca5d0fe9559ebb3494b8cb4cbeead8217a08628
font_01_sfnt_off00011bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBF 10620 bytes
SHA-256: 2b4001802fb49aed4786134d23d838e6e6121cf7ac3170fd2cedac25a0851cd7
font_02_sfnt_off00013417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13417 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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