Malicious PDF — malware analysis report

Static analysis result for SHA-256 1784850747c0666c…

MALICIOUS

PDF

85.6 KB Created: 2021-09-18 18:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b527275a333b3413d4c6762e4740dab3 SHA-1: 58fee5d1879356a736e215348f31f2d83e7c6fa6 SHA-256: 1784850747c0666c0bad157d708b5e0288383c3641621e5bbb289c3b0a4fb2df
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure and URL analysis point to a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://denizyemek.com/images/fck_upload/file/4013035252.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372e9e4e113---7565507823.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc05c10e5d---32152528315.pdf
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/bojuvisojo.pdf
    • https://technoarc.net/userfiles/file/95594137317.pdf
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/11989432411.pdf
    • http://kadh.kr/bobod/upload/file/39384211888.pdf
    • http://thephinhmienbac.com/upload/files/24822659310.pdf
    • https://remoteyourstaff.com/calisma2/files/uploads/bakolixawutewadodivibofi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429feac62e6---27678425204.pdf
    • http://thekitchendesignstudio.org/uploads/files/14893444339.pdf
    • https://ceylanotel.com/firma/files/9444215426.pdf
    • http://www.globalnautique.nl/upload/files/93098273021.pdf
    • https://bangprice.com/bangprice.com/beta/cms_image/file/94694023971.pdf
    • http://nicolalazzarotto.com/userfiles/files/vitokafaxinanuxafevapeb.pdf
    • http://tgroupsrl.com/userfiles/files/44428576919.pdf
    • https://poulinstrapscan.com/userfiles/file/60503962986.pdf
    • http://6nergy.fr/6nergy/sites/default/user/file/jodukojepir.pdf
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/37766625828.pdf
    • http://rklatex.com/userfiles/file/ritinatida.pdf
    • http://fge-service.com/userfiles/file/59102590290.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/53c4721c686e8ba3ffb796fb95a5912f/sexanelegaf.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/702ee311a82f893f3cb4412ce3c9747e/33663774493.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+boleyn+inheritance+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8fa.bin
59c3acfb20edc3f49a0c2eced40cd51d4a402b632d1ef790427d565b3a0c5132
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FA 18680 bytes
font_01_sfnt_off000118ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118BA 16792 bytes
font_02_sfnt_off000130d1.bin
5f4310ff611b298cfbf3ef7d3110272e7abc8853c4652cc37a15bb84299e2b04
pdf-font-stream PDF embedded font (sfnt) at offset 0x130D1 10768 bytes