Malicious PDF — malware analysis report

Static analysis result for SHA-256 344e718cf4ee4d9c…

MALICIOUS

PDF

88.5 KB Created: 2021-09-05 13:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 81476c272e710e82b66e12fb3a91f018 SHA-1: 104d2beb9baf4566401da2a73fe3245094bc9a8b SHA-256: 344e718cf4ee4d9cfcf0b5625f11a25aa731f725ff339ddc5e312965ce48706f
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage, suggesting a phishing or malware distribution lure. The embedded URLs, while some are confirmed benign, are part of a larger pattern of hosting links on potentially compromised or disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160839c8bb821d---gigawe.pdf In PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/55755831298229bf07c3a85718ea900e/gomorotovaderonimipomev.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/befifovozovafareda.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/vinuv.pdfIn PDF document text
    • http://pvvc.cz/files/kizoda.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/25419225800.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e768d49a87---17007399680.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/bosezigejetorojufora.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/cadf9bd2d385b00eda5ddda7f04bcc81/xafimewazozazet.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/669849f3510f44c871d6479c7040a0bb/2807037225.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/lavafudilutaravosizu.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/65089650550.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/somesomepufugituwadularix.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/29117074285.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608cac6c45448---12345158304.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/16403382827.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/1j54kmeqfbhulg51radcvmnk16/42203839419.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a0fff1e620ed74eebdb854b8966f372a/xexijakibuxagekotesozut.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/zobijobasab.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/somerevumajudorogiduril.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/57340746797.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/ce9a0f6c59c3f58da622646fb20166d0/dakutebugonaxax.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/15912053732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=convert+worksheet+to+pdf+using+vbaPDF 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_off0000f0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A5 19044 bytes
SHA-256: d10872e812dff5b81895c7ad3fd74ec886c96c3ed46b593d7950dd061791da27
font_01_sfnt_off0001221a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A31 11244 bytes
SHA-256: 9c8390363507365c3129c0ada23db5d144007eb32d6cd24ce2771f593e29d205

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