Malicious PDF — malware analysis report

Static analysis result for SHA-256 05c9ca86d01dc00c…

MALICIOUS

PDF

103.5 KB Created: 2021-06-27 21:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fa29692b71d264c068afe241c3f938a6 SHA-1: 837a7b68afe9c7edde83f0ea46cf210a60c7746c SHA-256: 05c9ca86d01dc00c0eb6db0254d662d4a19b704c6ae95bc808f721fcdee64b81
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised or disposable domains, indicative of a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further suggests a lure to trick users into downloading a payload. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=rock+cycle+reading+comprehension+pdf PDF link annotation
    • https://parklanehotel.asia/userfiles/file/55281290624.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/lumoxus.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf14d2e54e---renadugudi.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/mevatesozafuweniduvodof.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e14531fd94---32392933133.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a896bf93689---63244211137.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/xufulozuvufazelun.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb5fe60151---32887109287.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/246f2bd33edef3b09fe2f90f02cb5d5a/jikidojewukifisusig.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6406ddc621---93291028828.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/adhabpdca04a34adag2go87ju1/22888411173.pdfIn PDF document text
    • http://dgjst.com/upfile/file/ripemaxinivux.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072919dae241---82692429854.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/diu7h8cdm4gqc2bjmmfbsr6n67/sapidibowemubudodakuwaj.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/76370065865.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/ac857eda813fdcfbceb16791e1830cc6/55575898745.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16094574b7744b---wozukuzigakaxifakiba.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/59c1e8346cc3070de29fae154532ff8a/18276251551.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/sisaza.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/ce91dbe78cd8701d3b9dc64847cc01de/37604448966.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b806a620a68---bemekonivogevapavedenun.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baca122cce9---87995580649.pdfIn PDF document text
    • https://bem-sa.com/img/file/jododizazi.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/76098606174.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/gifomudotufijogin.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bc7ce7c22---xefitoxa.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607794e5dfdaf---gabiza.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_off00012e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001466f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1466F 18228 bytes
SHA-256: d039f7edfbb98b31ce418b7516f602cf26328660e4312d0498d03d0757e50599
font_02_sfnt_off0001767b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1767B 11220 bytes
SHA-256: 9d88502803c4ac092ce591bb5c2abdecf02963a6789a49f19e2d1daf24d54242

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