Malicious PDF — malware analysis report

Static analysis result for SHA-256 12820b5bb91d8214…

MALICIOUS

PDF

90.4 KB Created: 2021-07-15 14:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1dce6561a036461d1dc6e64bc20c8742 SHA-1: 547764be0c039b6fa3cc0b7c035e03f754e7d9a3 SHA-256: 12820b5bb91d8214d3abdd7038cab4bf3df9d754823da173cbd6e96932169427
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely lead to phishing sites or further malware downloads, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://pistant.ru/uplcv?utm_term=free+fire+best+emulator+for+pc+gameloop
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b99c87bf001---sibumivikoxikegawipoju.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/tqcil2m25bj9h1lnfp5rqnd0o7/19650591871.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9a7052659---12524747373.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/2idqnu9frf4o5lhbcv0l4m0b00/naxopigalufem.pdf
    • http://accu-chek-event.com/ckupload/files/45298755352.pdf
    • https://aihr-iadh.org/uploads/FCK_files/file/kutawuleg.pdf
    • https://mdteam.se/ckfinder/userfiles/files/fokamuvipuzowake.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/krpcf4kfbrn43njr672bhpmv87/vemitagafokup.pdf
    • http://toshiba-center.ru/uploads/files/79760235475.pdf
    • https://led7.ru/file/rogonimefawelobikerixi.pdf
    • http://naturallabs.fr/userfiles/file/vamijoxafujavoda.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf031d0ac7---vuruz.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/9bc45e35f036fc9159f91b90032a48b9/gofaruxuvotawuwirodi.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccbfc235f6---miredakuzojimafopuvoze.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f140b95040---53240859127.pdf
    • https://majubesar.info/contents//files/lakonikezinopimugiwa.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68cf080861---zisinarixumowugixenetozu.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/ca8c87b6da79d06eaa4c186bb1112100/7548123791.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083e6717ee68---gafudadotovofebofomipolu.pdf
    • https://atl-50.com/files/file/loxikojifozesofexag.pdf
    • http://donkaew-furniture.com/ckfinder/userfiles/files/nibidigerufupen.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608d18ee070d0---81164742683.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/11f9d3940d457f799a2799960e2a2f86/garisa.pdf
    • https://hansenlight.com/UploadFile/files/lemapafip.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609425940662e---wojutuxoritikuxe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f450.bin
9c5a2e418947995a58ab946ce5f6bd84a15844ebf746d9873efff7aaae4bdf31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF450 17408 bytes
font_01_sfnt_off000121dd.bin
b485c785bc844c49fd023011724db6f6d651d6f699a371fcb161c365e92c1e6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121DD 10936 bytes
font_02_sfnt_off00013b01.bin
ee6d8c25003eb2de61ee1fda640ec7b8e4605923364b71ee832b966c85f0f81c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B01 1780 bytes
font_03_sfnt_off00014364.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14364 16792 bytes

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