Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac34749f76f1924c…

MALICIOUS

PDF

84.4 KB Created: 2021-08-17 01:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0c818819b2e8d30c66a55b39416a99d2 SHA-1: 2e3e1eb6ab5f801dd3e9e4f4f8ad34c7ccf17441 SHA-256: ac34749f76f1924c12c829df0c286a9e694b1ea2cb0d087b39c6ea07d4926af7
164 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for phishing or malware. The presence of a download button lure further supports this malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a992db58130---67635536451.pdf In PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/5lm37m76cr4qdeqd3cgkr9n2jq/girapiguviluzemoworutelil.pdfIn PDF document text
    • http://yanartextil.com/firma/files/61752439859.pdfIn PDF document text
    • http://ccymgr.com/clients/a/ab/abc9983c1712fd324c9320bcfcf975a8/File/wunumo.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/vilawavanu.pdfIn PDF document text
    • http://emannsltd.com/userfiles/35895490085.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/sutonogazugunekane.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/wapufofasipoxigaxi.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/7pbt01smts3ld0smuh6vu722sq/kibujegubukutuvad.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/xagivadusuwedonuse.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a651f2f8e5---fasikavubifujikasedubaro.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/jusexepafexa.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/nuzepoxujolejuvegi.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/43943624024.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/32532061433.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/zupogotesuzaj.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/83511197892.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/55315093372.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/xukilujidenatutoxamabomuj.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac667b9bc09---94622060097.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/80809748798.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/4764c1aec009aa0b7d5df99a011ac4da/53012864666.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/af8587eb6e04b1dd5547ca020c62e790/pavowoxawipiz.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe491339fa---duwusuzez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=qw-200.1+section+ix+asme+boiler+and+pressure+vessel+codePDF 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_off0000e217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA29 17128 bytes
SHA-256: e332b9aa9cbbc8b1e3fe21217cd7293c611ecaf642f32a0bf41cae512bc657ff
font_02_sfnt_off0001272d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272D 11624 bytes
SHA-256: e8cbd6e329204caef8e29ba49707c58d7e3fa3fb1b3bef1e79fdbb1b56360bea

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