Malicious PDF — malware analysis report

Static analysis result for SHA-256 709058cb92722cfa…

MALICIOUS

PDF

85.6 KB Created: 2021-08-19 17:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 512954fcf0582926133a0c91b1e117f8 SHA-1: ccad9723a92778d24de988e21d58888e0d61ca45 SHA-256: 709058cb92722cfa93addf35faec62c2a44dec0a30e16d36327044be631c6261
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.003 Windows Command Shell

This PDF document is classified as malicious by ML models and ClamAV, indicating a high likelihood of malicious intent. The 'SE_CLICKFIX' heuristic suggests the document employs social engineering to trick users into executing commands, likely to download and run a secondary payload. The presence of numerous links to potentially compromised WordPress sites and disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://medvor.ru/uplcv?utm_term=windows+xp+activation+key+generator+telephone PDF link annotation
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/02qmm2p7t331t1jvp077v1e5ti/pixefikuker.pdfIn PDF document text
    • http://teresachild.com/upload/files/21602606092.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/epucfkijp88qupmvdotdplnheo/verufigutatusaxuzojadom.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/4tlprsb1kdjqkthot16fg2k34a/92147130372.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/9034318042.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7563da70dd---42602904146.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/suwuk.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/pavegidat.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210626050510.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/82778582819.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/8nvrpsgltu1be28k4bc0mdf385/95879510730.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/zidanomiwuwikuterav.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/0193b37ae3e2f93b29984995a10f6e5a/ruzuxe.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/74781377559.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608988a898af8---84517125494.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160983d4827003---kejuwatuparer.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c5306ee1d5613f892c3de8310600cafe/wibisotefafago.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ef740d311---lokateredubeles.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/90973162636.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/59657178230.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///tixumepelag.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/b70f2635b24502b5a78256cda267f82e/75852912830.pdfIn PDF document text
    • https://sy-tech.eu/file/59813477264.pdfIn PDF document text
    • http://airlineclassof66reunion.com/clients/c/cb/cb51827d251551eca15067b3b23580a4/File/4942836367.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/ok83ren9ctvrbplhpitcbj8pbt/10894363976.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b3f458677---renufiwilogewopixapel.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_off0000e93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10151 17352 bytes
SHA-256: afa6d7e2d3d12a16282ab83cce2729b68f292db2392a3375ccadc7bb2fe9536d
font_02_sfnt_off00012e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E59 11248 bytes
SHA-256: abfe906e6ff91ad9e395e88ef8911c4e647bfafc34ecbecf002bb746769c408c

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