Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6848b3af2682c7f…

MALICIOUS

PDF

170.7 KB Created: 2021-06-29 11:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 828ce75eb3b4980802ceb25feebfb629 SHA-1: e7863990583ec0a42e458a66d1647388baf1de2d SHA-256: d6848b3af2682c7f85e051c6ceb413c933d692a2391404d559b84a24da67ab74
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of external URI heuristics and link farm patterns indicates an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 https://wastran.ru/uplcv?utm_term=ischemic+cardiomyopathy+meaning PDF link annotation
    • http://edwardlankin.com/clients/86087/File/17450296748.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/g7o7l4fku4hrma1mvkv28pmd01/32784495325.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/8470db64d22617790a8df34f52ac9ce9/97254626988.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0861858c45---75733967892.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aff7a8562ed---54768502616.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/86dfed79982b2a955e609a9447623feb/tudatorazejadufeza.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086970607c61---garovamisizevubuna.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/mumedewad.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/lmn807ilas28rs0pkk2qqf412l/73186073555.pdfIn PDF document text
    • https://4appsoftware.it/file/nazowunizebaw.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29d2fcd7f0---38305128390.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/24354761122.pdfIn PDF document text
    • http://sun-eko.eu/files/file/konunegugori.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870806159c8---50143613146.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/ecbaf278010a348ca1165ff2180bb3d8/nafemopujejirubotopur.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f521bd6179---difobituz.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/wuvefakof.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/pamiwatotuvodele.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8a109ffed---12588562114.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608caff212180---gebidavujonubalo.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/fifiz.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/lajirazuranefeduweret.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8147b0aac---67536885663.pdfIn PDF document text
    • 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_off000234cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x234CB 22460 bytes
SHA-256: 94fba82ad55a196eca3538d38f6217d1054e8762fa30736f4af0e09eccaeb603
font_01_sfnt_off00026c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26C0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00028422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28422 10980 bytes
SHA-256: 659812c5090fd716b765ea9f73dd46e0b0f1d79b7118da52253d5f77eaacf149