Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c8073b3ad15a8c…

MALICIOUS

PDF

104.6 KB Created: 2021-08-06 01:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2075d77054f330787c2e0abfa130d084 SHA-1: 56c857ce5eac8d678054379557cc0afcf67390bb SHA-256: 77c8073b3ad15a8c2ceab1b0f5ed036b1d0734195cdcab4e6d1c2660264fc696
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The presence of numerous external URIs and the nature of the hosting (compromised CMS uploads) strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/p31o2bad3sun4j104pohho04j7/libosajibununatoxa.pdf In PDF document text
    • http://tlproduct.com/userfiles/file/5660815155.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160834765ea4f9---30904531363.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/51534293884.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/75sqljfduvdnt7pcfh7tn5nh27/53680092027.pdfIn PDF document text
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/zagituzaninubufukasufu.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210802_AA489A0B2B7DD803.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/lesaxunikidaxojodabug.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/47763466040.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/kcd4checugnumsf2de59rdf864/geduzofixepajuniwuw.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607d480192a1d---24337071193.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/ef78cbe01b742ed8379cf806f1affe7a/rupekemejewir.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/zabukividilawi.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/cm7ohasum4sn5d2m5imv13349n/goloxokinomukole.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/096ictrc2urcvt268507jq26mt/98844401050.pdfIn PDF document text
    • http://sanders-scottfamily.com/clients/26926/File/wibaniwok.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/1611786954.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e83bc30bd34---vafixofizewegazuli.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5d740108b---gutufizokimadililavuwur.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/d192f7f33c348108228256956db4fa70/lazagof.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/4d80279adf83bba6132116222cd27ebc/tebeviwofodefodidifaf.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/kevumalulidulakeradoda.pdfIn PDF document text
    • http://maihome.hu/admin1/file/gunapulagixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=formula+to+calculate+density+of+silverPDF 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_off000130d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D0 10892 bytes
SHA-256: 6f77acbfc759464a5142d4403839c7b6a61a38fa889901ac1c7be39277a97a97
font_01_sfnt_off00014a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A0B 18576 bytes
SHA-256: 43e2dccadb1b0bc5fe7630d97e16bc32cff882e4788b08210b3939b33d887dc8
font_02_sfnt_off00017b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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