Malicious PDF — malware analysis report

Static analysis result for SHA-256 8718beea1ff815dd…

MALICIOUS

PDF

96.5 KB Created: 2021-09-05 09:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c197d022a5f653e6e4fac83ba9a7de67 SHA-1: 8d4f3f5ec9b6cceb0bd6be81802fa4e9287dff6e SHA-256: 8718beea1ff815dd6a652116fe0f9d5dc839a5b90062aa23bded03ed001bcb57
196 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document likely instructs the user to copy and paste content into a command-line interface, a common tactic for executing malicious commands. Several URLs were extracted, some pointing to compromised CMS upload storage, suggesting the document may be part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://trustarshida.co/cache/fck_files/file/57118937413.pdf In PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/41641075351.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160988d394dfba---91622472770.pdfIn PDF document text
    • http://yuli-china.ru/d/files/zovikigokerajonefajuboz.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/0f4126092b1f396bc90f10a75d3509f4/56279007380.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/rogorebasuzoj.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/dinozumamugajox.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/xitesibokudirulukejim.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/sawijinifepevetotete.pdfIn PDF document text
    • http://macphersonproperties.com/clients/876251/File/vukalixubuvuxekolupabi.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/11864599725.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/50079682584.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa97873d33---mipamafurojidekaze.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/tigenumud.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/42568627916.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a0b227a7b---3724326435.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/ef4b81b5579008ad200ae4f5621187b0/24551938262.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210814073535.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfb1f98da2---vuxunebamegesenuvo.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/45681037710.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/27522412434.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfd2c9d51c---sajoloxafozupotef.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/pilalo.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/e0f8cc2ec0a1edaa7bc0625d3371b9df/24388015003.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/bimefedesevikamote.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ms+project+pdf+titlePDF 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_off0001156c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D83 10468 bytes
SHA-256: cacfb92a380b33cf4e363837e718c6548d5ff361fe90539f2157c4f0d656c5a9
font_02_sfnt_off00014558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14558 17928 bytes
SHA-256: 1aec920c14cb007d8bc1dfbb74c527fd8e32bd6b611bfd062a4c90f591431db0

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