Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad373a3ca438d07…

MALICIOUS

PDF

70.0 KB Created: 2021-10-01 04:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 811da5ef550d8268a9a5490c449f4684 SHA-1: b3aeb8da6e6e4b4e723f5d9e6f5e731f8270bef5 SHA-256: 5ad373a3ca438d0791370ff55eaf1d212a40b2aa38f8a4d3f93b45a7d104e009
176 Risk Score

Malware Insights

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

The PDF is identified as a phishing lure due to its small size, image-heavy content, and embedded links. The heuristics indicate it's designed to trick users into clicking through to external sites, likely for phishing or malware distribution. Multiple URLs point to potentially compromised CMS uploads and disposable hosting, suggesting a campaign to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://bbmpva.nl/fckassets/file/gesemomisu.pdf In PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/302025594324.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/tigotirepajofugibak.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/66122097955.pdfIn PDF document text
    • http://stl-hk.net/userfiles/zekib.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/22390142246.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf33a2e431---54007698961.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/94778872111.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/93772498309.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/49e66952206cc815be285ab63bb5a854/jirinesik.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/newilurirolafukupupaduza.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406ae435fc9---jogozesupotabut.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/1ae051db96f83a0f502c12e2f9a25b3a/fajosasevukifixav.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/midepulofegemutafal.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/13242078829.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/26231303960.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/52383635265.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/bidibekudevexurip.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/1650198936.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161562d6617d98---59008218733.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/161309f4178b3d---29088996153.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/danodivuninetofuzezof.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/56234449925.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/57473047937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=fear+the+walking+dead+season+6+episode+8+online+freePDF 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_off0000b392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB392 14300 bytes
SHA-256: cc57129a617b8e446381255a729c68f30dd98cbdbc38ba631b49841a32d07688
font_01_sfnt_off0000d74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF63 11308 bytes
SHA-256: 4ca85aff48372c87e4ca3332e6e9391f2fe0bf1ed7d40b597e3415473bdfd99b

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