Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac22eb5b6b1cec86…

MALICIOUS

PDF

120.9 KB Created: 2021-09-03 04:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d4001c09674b7983eb816736cae618dd SHA-1: dd6f8d073d5ef71fbe1b9fbb0988a0456b8c1093 SHA-256: ac22eb5b6b1cec8668372aecb01bef7f536b0126817a59cff5dbca5d11c77f7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of multiple PDF link farm heuristics and the overall detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://fisioterapiasuzzara.it/userfiles/files/25741185313.pdf In PDF document text
    • http://fapannimario.it/userfiles/files/59542481663.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/28019784267.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/24a78f9932265ef7909660b83cb4d0a7/31630924455.pdfIn PDF document text
    • http://iwort.de/userfiles/file/kawexunezomiwuvamoxuk.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a39b33dcc54---dawigezori.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4143bb1eb---63575870816.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/kevofiligaxatud.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161184ca7e4497---kaberamilisar.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/siwevatefimivokagel.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/gifugolivizudak.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/kufarabonozafilotuxerazer.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d5fa973c1ca---86811847965.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/tosunekunezigesed.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2dca200b4d---96970619677.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/vozitirikurekunojitozetib.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/eddd9c3637ec733938ee1ac4a42f2fd7/bilokobasokiwelevuribiba.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b84d1f4c92e---risibelepaxabofusepuxe.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/c1726628676050781e954bf213d90e99/resinu.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/eefe96243b9f5e2274c01fe031820cce/11893669308.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160be00ae0eded---20404876526.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/roluwukuduzifejizowo.pdfIn PDF document text
    • http://annabarons.lv/files/files/72200959416.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c67a87e58517ceadc5287a3a2824df8f/49028572662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=fukushima+accident+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17648 18176 bytes
SHA-256: 561e9f0821d9396b1bc03b971ed076643631ff373dc5c06bcbe04d09a641df28
font_01_sfnt_off0001a52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A52A 10788 bytes
SHA-256: ab0533537f85c4b4e61f1f8e44a73c696551a212d8a3190bdfc7a442d1a9a22d
font_02_sfnt_off0001bdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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