Malicious PDF — malware analysis report

Static analysis result for SHA-256 56c9c7a610d335e5…

MALICIOUS

PDF

80.5 KB Created: 2021-06-26 07:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c35c60f5791b0e1de4cd84bb3bb8d79e SHA-1: 32091e9bbdb794c9a62811b9618d06a54bd4cb40 SHA-256: 56c9c7a610d335e50e88f7d9e9d2a08b21fd9304bfe8a594697f70fa7a0668fb
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 high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or phishing pages. The presence of external URI heuristics and link farm indicators suggests the primary goal is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://smidgel.ru/uplcv?utm_term=1985+chevy+suburban+for+sale PDF link annotation
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084d75284053---88015606143.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/94f18e43e68d5b8eb76f686a6cde7571/12493055873.pdfIn PDF document text
    • https://dineflon.com//files/64792690512.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/799cac3dd582e16ee126f3e3ab0b5ab6/89071066128.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/51032532805.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/86388671461.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d34382823e---5861497112.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a480dcd0885---jekofoxibisa.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/57fhnvgm18d56u5rmqbpju5ijn/27475115621.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/96346320811.pdfIn PDF document text
    • https://lasanisports.com/files/kikataruwokisanaw.pdfIn PDF document text
    • http://apvn.info/userfiles/file/pusitumefadakiwidavivew.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c07e81598---rasezulum.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/jaximurax.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/5asnpe63tpv9iscruhkm6gbgdv/8713540433.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081af85e7497---sevomobesowobabirutaxu.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ec59aebb9---69170026004.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/95530204784.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606da791b425a---65369275072.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/88309464213.pdfIn PDF document text
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/7eaa4f606b476633c717d6843097f321/gitag.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84c30851e---58524732588.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081ee8dd5039---zemovivamif.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb505870d00---savemop.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD549 11128 bytes
SHA-256: db0eccaa2566ba06afaa91d71303a882ce2110ba37696e459ebfcf669960e50a
font_01_sfnt_off0000ef53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF53 17208 bytes
SHA-256: 67eb2df3c50ecdf9231287eb6c48e293f5da970305c0f18825dd5f23be9c6186
font_02_sfnt_off00011cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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