Malicious PDF — malware analysis report

Static analysis result for SHA-256 a82ea1b8b5ac6d42…

MALICIOUS

PDF

83.9 KB Created: 2021-08-15 12:41:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6099fc8197b92f121c87d1ff3dbd92c0 SHA-1: a588ad9af34eb539e55a8b0ba687ef70328e13e1 SHA-256: a82ea1b8b5ac6d420d22dc7f844031887f1a22165300e0b3aa2fcb5d40cbe1a2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to potentially malicious external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26c1c2b8ad---91030272214.pdf In PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160acd307894db---vafarupebogerixizoz.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/xajeniloxoboxeduji.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/zajekitajuxijizatalu.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ddd1c9c8121---xawiz.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/17410670878.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/kifozojavobegel.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/7eb4caa3cf93c2ffe1060267e7b55bb4/56137801652.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/9251363e446bcceec07aa51d5264ec9c/jodifabuvewi.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/55607235156.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/10471179365.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087852c37ffe---wekesebaxetamexuxuteton.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/tojavomewidoxafoxaxobo.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/rubage.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffded0b84e---20128003481.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/96390232068.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc29c445f3---81096426690.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44dbd9af56---50011768998.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/16145350873.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087b6f620f7b---ponugasesesopon.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/ea235082122a3a6b0ac65bb07cf65bb6/lezusigix.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/62f2907668d86bfce1b1b2ab20c98181/fonamodupi.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/86021401153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+use+toro+recycler+22PDF 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_off0000e5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AF 10276 bytes
SHA-256: cd5b7279f707e9090db052f6b4655f407b10f9f56d0bc65e065e0c3c4adefca1
font_01_sfnt_off0000fd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1E 17244 bytes
SHA-256: f3d3520d1f92b4f40a477d0f2a351837f07c6561bfedf5eee2a7f97583cc3078
font_02_sfnt_off00012997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12997 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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