Malicious PDF — malware analysis report

Static analysis result for SHA-256 a12cd965badb20e1…

MALICIOUS

PDF

83.1 KB Created: 2021-09-23 21:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b2128a6d66d34d374554baa5f562243c SHA-1: 3d945f4029d804cb639457392783edfbd6465bf0 SHA-256: a12cd965badb20e1973c7abe8ef3368aff29062a18fe7441cf394bf8099b2444
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics strongly suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://crewmak.ru/uplcv?utm_term=free+gta+money+generator+2020 PDF link annotation
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/97941211178.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/53363449239.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/130f7846241bdd1187ff08a33940734c/10909520461.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/95692713594.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/88515423076.pdfIn PDF document text
    • https://qnzar.com/files/nabimeg.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92095253685.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/dipegolej.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/kodafodezudemefekesejika.pdfIn PDF document text
    • https://slotpt2.com/contents/files/19945438225.pdfIn PDF document text
    • http://clerus.hu/files/file/kasesabogeximitejed.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/rurelaloxavomut.pdfIn PDF document text
    • http://cocoal.com/uploads/file/sapug.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/q7ouj6dmmvqstovdjaqbrqf2l7/38812283340.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/xenurifigaki.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142153b2eb88---97642543954.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/34145856648.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/78883064892.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bba41eb76b---lovezibivewudowode.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/fdk26agdcn1ldv4vnjd9jnplns/kezijinonuxemifodenenu.pdfIn PDF document text
    • http://rotang.net/userfiles/file/56007741.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/vaxaxomepaxemovili.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c1f4cd15b---58540188320.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/17349779798.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_off0000e116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE116 10480 bytes
SHA-256: 288c50bb0cb7e7b38080ae937b5563c37ed37be017aae98345269690c9235f44
font_01_sfnt_off0000f8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8ED 17924 bytes
SHA-256: 910394673da175e792e34f5f6d82626bf9a53bd3a300912e5a721b4580e69d77
font_02_sfnt_off00012717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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