Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b7e5739c05656a4…

MALICIOUS

PDF

97.8 KB Created: 2021-09-18 00:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cce75337ba04ced823c77a53d0d3cd16 SHA-1: 18dfa97880224974398e8b20439d8d1aa7eeb7ed SHA-256: 3b7e5739c05656a40e5dec6ece5fea205537f5060b3f2587a6a71e2de96d402a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to compromised WordPress uploads and other potentially malicious domains. The presence of multiple external URIs and link farm indicators suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 http://reichspfarrer.sk/file/soxerexekukenej.pdf In PDF document text
    • http://n-production.com/upload/fckeditor/file/29929837687.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/25151752212.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/88577608602.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/44441036653.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/mifunasupiw.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/jokekududafekejasiduteko.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a3211fe52---xutevadanitefumajofi.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210907124402.pdfIn PDF document text
    • https://armenia4d.com/contents/files/nevisuv.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/17686654814.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/59381807576.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/tenugikodajojo.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ba81cf554---nepudukarusowefat.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/japarelemale.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/seruvotafijasidujopub.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/57090607448.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/nekutevimazevivog.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/80021699033.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/sebizawasevazisarite.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rokinemuzigopawexobawu.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b5b233c7b---54358343980.pdfIn PDF document text
    • https://avflash.nl/upload/files/daxobegoxoxowivasum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=house+rental+management+system+project+in+android+studioPDF 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_off000119af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AF 11192 bytes
SHA-256: c7403cab1ff0baadbd187f2269ee91a23f02b2e8b85372a43e31020af51bd970
font_01_sfnt_off000133a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BBB 17588 bytes
SHA-256: cccb00fb5d2c45c3617c9fd28c8e5766ac71af90386dd2c15548b54e25d50373