Malicious PDF — malware analysis report

Static analysis result for SHA-256 40bdc26ce4beb8e7…

MALICIOUS

PDF

79.7 KB Created: 2021-06-28 20:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3968174564c8548dd28395a5f92ae434 SHA-1: 58c8584ca18b39138fc4be18a5ea5750462d6055 SHA-256: 40bdc26ce4beb8e7ce71f639139b933a32ae2cc8c095101d8f5d9e8f689b1f78
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The presence of link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://promador.pl/userfiles/file/texotelez.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/f9316dfc2f2a7dc982722b775dd29d04/lofusumosumiripozafevu.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856dd26e279---kewujason.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d3b821fee---87281544538.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/9c3a9dd6a8d683ce4450304cd75294ad/wekipinugon.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071eb78086de---nemelinexogolotedumozubi.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160838abea20ca---fafaterugudowitoripe.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608827fb3e435---jidoxasiluxelaku.pdf
    • http://nhs-carpediem.com/clients/46367/File/bikilozolozodoxakupu.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783fd1852ab---sefezukapiwozatexidomom.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8a48083c8---zenuxog.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-23/20210523135450490131.pdf
    • http://ruresept.ru/files/file/bilavedutokepukude.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774da4d4d75---najugopevaletiwoj.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083e36fe7262---gokizutobut.pdf
    • http://sukhabalka.com/files/file/zarabotuvitemufezo.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/24772896722.pdf
    • http://cpils.com/userfiles/file/pulejusoj.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/03ep4chnpbt3fba6ni48aafca6/naseme.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/f4dda5d9e30a62c36201059cab8591d2/fojirosemirulusisem.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c370e969fc8---sulokiwogifelizoxena.pdf
    • http://aftckwt.com/uploads/file/69306787553.pdf
    • http://garderoba.sk/images/_file/37585450359.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e92325c86---44580610998.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=new+breed+grappling
    • 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_off0000d581.bin
bc111ccca9e92706123780f11c649afaa3ba33e28eb6b80574cccf826efa0c93
pdf-font-stream PDF embedded font (sfnt) at offset 0xD581 10384 bytes
font_01_sfnt_off0000eca3.bin
a3c0df4678526ef2871b398847feeadc3c91eb1f27c3c88222de0d212ad30121
pdf-font-stream PDF embedded font (sfnt) at offset 0xECA3 17272 bytes
font_02_sfnt_off0001197f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1197F 16792 bytes