Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db2f0027a9eba7b…

MALICIOUS

PDF

90.5 KB Created: 2021-07-04 18:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: dab7449ba59176d706656deff20a5735 SHA-1: 5569f9fd5d438327205279039031fc9c0023d470 SHA-256: 5db2f0027a9eba7bbac3803b9a2a304686b2bbd9aae7a9d4181b6fc6ffdec39b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories, suggesting it's part of a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b138a320d1d---dijir.pdf In PDF document text
    • http://alemotta.com/resources/original/file/53911520543.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160975f2a8e1d6---tebixinomuga.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a47f8f3e924---44077741926.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ee48562c860e86304c3dc8603b983f83/3384845884.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740ac3c7612---92987003986.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8252a35cd---kisuribodakuto.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd8eeb17df---wipitabamelidavopiwutig.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/7719580750.pdfIn PDF document text
    • https://artbynela.com/uploads/file/latek.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d02e8302534c9b3c13cbfac62728a356/10395474638.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/99833024105.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/degejiwo.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee37de4b79---sujuxabifuxarin.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/megaviw.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/30859798447.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/7b58b3a26c0551bbebd72c3a8a783e15/zezofofexoj.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/libopijijonawiborijedop.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea0eb064f5---14870036081.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/ae55474055e915d3960873efcf03ca6b/61457947758.pdfIn PDF document text
    • https://onlinendttraining.net/files/22140970238.pdfIn PDF document text
    • https://penal-garazh.ru/files/87916295696.pdfIn PDF document text
    • http://www.victoriousintl.com/new/resource/files/31183343008.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62f3492fd---59739785865.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/c9aabca0b6794517acece227cc750beb/38674123439.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/cc1ct6tk2u8mtqtggsugi96d8o/82799407912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=lmfao+sorry+for+party+rocking+songsPDF 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_off0000fed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E6 16828 bytes
SHA-256: 519b29727db775710b4347cad6810d52b5672c2eb06e8969f6fabdca5e03bcb9
font_02_sfnt_off000141f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F7 10808 bytes
SHA-256: e67e1b6d4bf094ce69e1fc7a9ef005aa8c4240a7724da0bb28dffa569234fb9c

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