Malicious PDF — malware analysis report

Static analysis result for SHA-256 5452bbadc2aa5227…

MALICIOUS

PDF

85.8 KB Created: 2021-09-07 09:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e2b6a176458b672e4ef35d4b74b69653 SHA-1: bb39ef2bf68bf1613102441e30b813633897487c SHA-256: 5452bbadc2aa522796ae5c03b90ffff23a17734531fee7341d95335eb291441f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to potentially malicious or phishing-related content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

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://nakajima-ya.com/upload/save_image/files/5255573123.pdf In PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/8ca10234f1a68cd47e8318d0935bba27/39267487980.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/toxugaromiwexol.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/mubagetaxovagurisowivuvib.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/cnmvgk3jjcstps7fvja89sfa0v/tibibotamo.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b517cc1290d---xeguteridogal.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/86699405379.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/grph5m995h34spn424qtac0rn0/gegivas.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/6ad5a1ad0ff56dc83dfd8202eda9eaaa/48882789077.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43ad5595e0---67622246826.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/wowarojawi.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/77316180373.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/18154015593.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/32967398652.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/859fa634ecee5cd53c0efa212a3b616f/funigewuz.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/0185d091f437d30e9cf224d0e637f855/dagekiligajowo.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/55391885446.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/toworugil.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/1846132701.pdfIn PDF document text
    • http://nktrading.qa/file/files/53072880695.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/7f3fcb64b402d0384ddb1122966819b1/78813595799.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/gotujilike.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/567d466f1c8314b3f73ce8c8bbca6039/45649378762.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160864c956584c---bozakugenakedetogarori.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/56472270094.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/ji30peekmtbtr48n9uhub83gui/zirazixegawabopimojojuvif.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/6a88c16ca3c19894c26d6bb45b7a8647/vujujoxaluraxubezitixup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=qasida+burda+shareef+with+urdu+translation+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
stream_003_off0000cb16.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCB16 18504 bytes
SHA-256: e8bd5ae8dfa42d5d2b576e91fc6311e2c3edfa7a2da57c0aa477e8cc9db8ff00
font_01_sfnt_off0000e8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C1 10980 bytes
SHA-256: 027f7fd859fceb77eb995fd7aa441cef960255fd2a7fcf674355d242ea50e4c3
font_02_sfnt_off00010217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10217 17460 bytes
SHA-256: e8955c0997bddac050ae3012f0586463d81e9ee5a4c4c9c60060f46b4e63c4cc
font_03_sfnt_off00012fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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