Malicious PDF — malware analysis report

Static analysis result for SHA-256 af46846d024a5786…

MALICIOUS

PDF

99.1 KB Created: 2021-07-04 00:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c96f2f92e55723c80e7eeed4f4d471cf SHA-1: 68a072ff2af481c3beba462edfd9a9e936b112ea SHA-256: af46846d024a5786a66b49e53f4f20cd1b2158190c23c4fe0a6ed1c52ddcb69e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple compromised CMS upload links and a high ML score contribute to the confidence in this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160983178ceeb5---67721586891.pdf In PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160703fc9445ac---tenazavini.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/40113439680.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ae9f54276---89355429222.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/lexunupitawavitokitov.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/36330140905.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/34938891382.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/konatokavepixuvogal.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lifovudoxopuwodifinaz.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5485d3a77---36071219284.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/zitevudesopone.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/f591741d06e466ddab8bffcb04b8a38e/dewibigesot.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/lj8dqkaqu65vq738mk96239bac/71839346655.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/c48bacbc996e1a3f9e6ad7cd0cdae778/91042369313.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160874b15bf7ee---zapomomaxil.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/luwudetala.pdfIn PDF document text
    • https://noventa.cz/media/files/file/jiruvegesebumajes.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607023c29ff83---34836231632.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088183a411cc---lizevozukinobu.pdfIn PDF document text
    • http://islandpointfl.com/userimages/togilugukef.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/28970357282.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/f7d1706b7f2eeb9c6e59297c20e789e6/32630868993.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ef0b5a74a---83920077038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=getting+angry+is+actually+punishing+yourselfPDF 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_off00011d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13596 18252 bytes
SHA-256: 2a96c7493f02037994df5fc6be749522da8352b80c5e58768dad4d9b7e3302fd
font_02_sfnt_off00016571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16571 11012 bytes
SHA-256: 818a682734004aad9b5a8083449912d91cf90a822537ba05bb8e27373ae3670d

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