Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d7bc3e35971d04…

MALICIOUS

PDF

90.5 KB Created: 2021-09-01 10:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ea76358038cbe83e2521f6a8cfcf34de SHA-1: 5f07781ed26500f8bec03d616ba45c35c8d91d0c SHA-256: e5d7bc3e35971d043143a558a384835844fbbd79b75ff5bc4e9a5fe0329c6ee6
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 as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and a link farm indicates a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://najarshi.com/basefile/najarshicom/files/51807288278.pdf In PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5c7378169---tafajiraraka.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/lb2qfh1k1cctgcthardt78e8u6/bexexa.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/e4u9lecs3gre9u3bv8h5a0p575/68035564927.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/41563491054.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4762ba94a---xomawolifitaw.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/nafewovevukaxibiv.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/39375021189.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c0de81602---41787210740.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072953feb277---50245574759.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/tububupuwamiposodugex.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210729_222325.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/9d5fhcp5nidnhso08qn1q4ifqg/fopijufobowudil.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/as0akf8a91rlmpph80fttgq702/20094009314.pdfIn PDF document text
    • http://thecoferfamily.com/clients/7/78/7892d776c92a08c80f86ebc6236678d2/File/kafapatodelofogifawalogok.pdfIn PDF document text
    • https://ijp2.com/contents//files/fodelikefadabuvunitu.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/44db52661b55b20de81561efe022fb0c/96910096736.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/bawutodaladowanox.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/27323082896.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b767eaab1---15646035444.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/famakexidavuziguje.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/foguvusezapinali.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/74558152160.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/goxetipo.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a924873c16b---nurulevufufif.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/r07gp6kre163ek2fl5b6493fg4/zunipimekunapeduponek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=worry+tamil+meaningPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/samakarimirajug.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE113 21068 bytes
SHA-256: 31850f49ff62959b9d93a6c1edf259c4999e1dd152b8f6ccfc17955bfd7e7036
font_01_sfnt_off000115e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E6 16152 bytes
SHA-256: 0f62411f33c11177563efe33ebd0105f37df2a55e6a92cd5aec3f2cc21bf3838
font_02_sfnt_off00012b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14390 10392 bytes
SHA-256: 23d29415f675c9e4110c0949339b3dfb847c4e9e2c1032173863e7b2acea28c0

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