Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b735ba2c9269fb8…

MALICIOUS

PDF

99.4 KB Created: 2021-08-13 01:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a1df9a0140543065cf0693a993f8ee78 SHA-1: 272643b29dea8835575154c5c97382e804da4a42 SHA-256: 2b735ba2c9269fb835deac3b62820af0a6d7c675be9c3cae22a0fb3c01e20d9b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. Heuristics indicate the PDF acts as a link farm, directing users to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a088eae797---mujewukeposatizax.pdf In PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d5c3b79fd---50593158836.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/letudiw.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/lukoguna.pdfIn PDF document text
    • http://lossfundraisingevent.com/clients/f/f5/f5ed5e364f2f51aa46a4c5982fab9a07/File/bekepasiwup.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/33d315b7a881e78ae6e128eb6020d099/59018711105.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c70dd4eef9---jowamofiguzefebusepikabi.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/59340908319.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210507001926.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/f47a9467ad1b22ceee9143932a749624/26340862634.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/kimikegexijed.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/fositafobutojuw.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607757be5bd66---sesadarerezejoja.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210519014339.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/a1e653d5332b3c9593146455d8165077/75552315126.pdfIn PDF document text
    • http://jcpingie.be/public/files/derigowedipejodusiw.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863e7d63bd6---mafojuwakewiwezevivabuv.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/63fb0c3c0ebc86896d85cf0de05fad0d/ginizeka.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8a24aae130---74804324724.pdfIn PDF document text
    • https://gilbertems.com/videos/file/3014075554.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/6ta53aljq2aloumrtvus97ljs3/mutevepupuwerizigizur.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b6667758f8fee566327254a084c8a9c/jazeronowelaf.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751a28da26e---72213210712.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=les+secrets+du+coran+pour+etre+riche+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A8 19540 bytes
SHA-256: 96d4238956a7f63265fa733e6dbd9dd2513d6a7b3501aa86817772e89eb4eb48
font_01_sfnt_off00013379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13379 17168 bytes
SHA-256: bf074ba03e124f195e34d689dc60022594b9dcf0f50fb65dce39e317f1fc8625
font_02_sfnt_off00014ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000164fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164FA 10728 bytes
SHA-256: b8fe468646cd417f2847a4c72c6651bcff164ef3f1c6d4196fc4672e86ee0569

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