Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a1f6ae0f2a4105…

MALICIOUS

PDF

84.0 KB Created: 2021-09-25 06:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7a969414fded36542a3577614e5e31b7 SHA-1: 7411e8ba8046bf64df321b28231c5437187a54e7 SHA-256: b5a1f6ae0f2a41050db63f7c4536c733305e684f22edc4a257ba770f37bb17ec
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The presence of numerous links, including those with 'utm_term' parameters, suggests an attempt to manipulate search engine results or lure users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://juvelyrikoscentras.lt/Files/file/43927179286.pdf In PDF document text
    • https://aurorahoian.com/app/webroot/upload/files/22066184906.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/53339858394.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/35632593737.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/152005487.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161411e26bce73---lifijakedilaziforuxixeza.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/91758391977.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/81003076921.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/l3952mc64mos3kv41dcsoom5e4/deteb.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/24b1553c243c8c03344ac32938146bc3/409170104.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/kafalugesopumaxiwefoju.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/pokoxowamidagaw.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/f92c362dc5aab88cca80c6d2b7e0494d/sotugabaxaxoverepusajizir.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/36403914134.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/53500940924.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161327b8e45562---bavifetifo.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/bidilukarapapepade.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5214150c6---18061103564.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/vuzol.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/10319339520.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/31906697910.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/273e3b8525ddd1529733d2cf1801a7a2/99146285771.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/62470696918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=aplikasi+untuk+buka+excel+di+androidPDF 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_off0000e299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE299 10920 bytes
SHA-256: 02943fa8b3865392cfac1f360350656d4de7d1c88def4b7a750e666d75085c2d
font_01_sfnt_off0000fbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD9 17640 bytes
SHA-256: 6979e21182fe50a790924368b24a1f6a0858011d82362649f4ea75791bcd69f7
font_02_sfnt_off000129d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1