Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e4596aa7c0e13c…

MALICIOUS

PDF

83.0 KB Created: 2021-09-04 08:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c90c9730646a134afed53d0f2b6e88a7 SHA-1: 2f90d1fd55debdf33514fa4150c4cd6672aff630 SHA-256: 99e4596aa7c0e13c38d0e263130ed838ee477665548f345ffba5a1773867aa11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to unknown or potentially compromised domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://giovannicaputoboutique.com/file/wurujasuvileviwize.pdf
    • http://beveragesgs.com/userfiles/file/vimoworiw.pdf
    • http://ahcxdq.com/uploads/file/040302212278.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b310cd6ec7f---40334223365.pdf
    • http://optykglowacki.pl/obrazki/files/97889084788.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/a81213b8f2e3904f63a7615db107b896/91331495955.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/42946171cb4249b6679d192226791286/dujejovowumexip.pdf
    • https://phatgiaolongan.com/upload/ckupload/files/jezezefujonavuxuv.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a394b240f88---30295682026.pdf
    • http://yejida.com/userfiles/file/rapizesulezed.pdf
    • http://dztechfin.com/upload/file///kitakavetup.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/2461767390ca04e31926f536fcdae569/vimodanigef.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c95b1d86bf1---86080482779.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080620776076---96871077849.pdf
    • https://fablab808.com/nbloom/fckuploads/file/kesevu.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/534187888802279c612ce6993ec77d92/zevoziduxamawoxix.pdf
    • http://20thhelicoptersquadronreunion.com/clients/71358/File/gulikupelidazanunato.pdf
    • http://oreade-breche.fr/userfiles/file/16078799874.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/3cbea1ec8a1d4762fdd2684cc4f112eb/vamalegibujitizezox.pdf
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/kexebajamip.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/f7582ca0d34f3fe27c7030b587dc1893/36276972418.pdf
    • http://marinapogon.pl/upload/file/43089910903.pdf
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ganobit.pdf
    • http://deficanderel.org/clients/6/67/674a09facce11b7629d390eef9534ff9/File/80014728951.pdf
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/lenijesovebusajotuves.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=henry+beston+the+outermost+house+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_off0000dcf7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF7 16792 bytes
font_01_sfnt_off0000f509.bin
21db29ec81ec87ddac5d165ff5e75457d650576e14cc17356720816ba8b9ee80
pdf-font-stream PDF embedded font (sfnt) at offset 0xF509 18744 bytes
font_02_sfnt_off000125ba.bin
df9614a2d538b2c14210efe8789d977995fbc0f9fcf1b02d2528d6c1c3937e97
pdf-font-stream PDF embedded font (sfnt) at offset 0x125BA 10808 bytes