Malicious PDF — malware analysis report

Static analysis result for SHA-256 085cebed8689665d…

MALICIOUS

PDF

90.2 KB Created: 2021-08-08 03:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bbfca086de38f265455f29d8ce941238 SHA-1: ae507049858c00df273337ac80e12668d140ead4 SHA-256: 085cebed8689665dec2af4d8580a2ced4ec46775c2408c4a96779ec8b879ae93
164 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm on disposable hosting and potentially a compromised CMS upload. The presence of multiple URLs, including one hosted on a compromised WordPress site, suggests an attempt to redirect users to malicious content disguised as software downloads. No scripts were extracted, but the overall structure and URL patterns point to a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://tavio.su/files/file/kuvaxetowibixegewarezo.pdf In PDF document text
    • http://cga82.com/admin/File/59607254963.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/xivugapizetinaxesi.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98114491034.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810720781f4---kajijemuf.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/36350176802.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a95e2adcb---32892596294.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/14673708756.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d31fc32d183---jugusuxusevawixuseju.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/fepidos.pdfIn PDF document text
    • http://stepsforstarlight.ca/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/nafivewoxarifimunobebozox.pdfIn PDF document text
    • http://supporttmes.com/clients/2/26/2647aeee05d38019bb2ff7af4ee9f9d5/File/suderupiwabexukur.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/juzipavelava.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/962si5abo04lj985keee7b4lfa/25236522395.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/tisapewib.pdfIn PDF document text
    • http://carsongrad75.com/clients/3/35/35717660c32d3dd9b0ffde8f33a19d23/File/16485311478.pdfIn PDF document text
    • http://restorationteleconference.com/clients/73716/File/gimozedesap.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/digupexavoze1628348097.pdfIn PDF document text
    • http://poiskvod.ru/images/file/rixifusew.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/c7bgavqpfpu60cmb76hdonrhl2/63841354881.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/vasapevara.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/26e25c5036bc05f81e00cdc9e7bbc426/92679191652.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/97186090352.pdfIn PDF document text
    • https://andrejc.si/files/file/73263698204.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/kusodomaxefow.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/3be2dea7ac737c500ad4711ce083e4fa/7812518293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=coreldraw+17+free+download+full+version+with+crack+for+windows+7PDF 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_off0000fc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001149f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149F 11052 bytes
SHA-256: 6103b69721095cd14ebb4112d1312d194272d4de5a8c6c0c3c151daaa8967e8e
font_02_sfnt_off00012e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7E 16600 bytes
SHA-256: c725c505c6a4939897bc03f9719a4a6e4346126453c14ac1e5c296640b10ffa2

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