Malicious PDF — malware analysis report

Static analysis result for SHA-256 1349c5543cc90817…

MALICIOUS

PDF

84.2 KB Created: 2021-09-16 08:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ae1dbc27b144cfde29cbf1fd2df57238 SHA-1: 9a3ba9bae31c72e6d38fb626167f54b721c73556 SHA-256: 1349c5543cc9081725b3d15aeafb86ad46470a45d2c69c7d1de66c371cfc23e2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs, such as http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161429e6d24e0c---kamarexaxosakegomopafawez.pdf, are likely intended to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/lakilagitumojazi.pdf In PDF document text
    • http://alnoorcity.com/userfiles/file/2930482361.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/1085314575.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/54680055883.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/75613046293.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/80761015920.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/96161776664.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/bomaf.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/tefuxoz.pdfIn PDF document text
    • https://n-tlg.com/files/file/18659261578.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/74215994885.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/vesemapozipafotalefo.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/10186423657.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/13059717194.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/lazetozabolaredurixiliru.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/fd28a3fb38be404b2eeedc8774227333/53083135257.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/mupirezugopudinosutose.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/dofefifedapexageme.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/31631007744.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/m850v799vq8b60posj3dd2dcmu/daguvozugib.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/39246505408.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161429e6d24e0c---kamarexaxosakegomopafawez.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/fuvufukovopemugozulo.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/tezusonilovizulesezaj.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/zirij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=pet+games+for+androidPDF 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_off0000e6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F0 16872 bytes
SHA-256: c15bbd257741009da10ae3245b7be33f374eb2fb5f3c75b5dc82eb1cae39d593
font_01_sfnt_off000112a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A2 10652 bytes
SHA-256: 914aefbe42be716ccd39636f3af3316b0d6e0ce13e847b66992fb630bdbd6376
font_02_sfnt_off00012ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1