Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1fd848fb8181968…

MALICIOUS

PDF

86.1 KB Created: 2021-08-25 12:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ec07314264b50caf49e4b25bb8a556ba SHA-1: 1866bd58dc89106506b549e3e07ae205f725b4a0 SHA-256: f1fd848fb81819688925862060bef4c7912b79ee3c91f587464b9feed57ab6a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://queure.ru/uplcv?utm_term=only+money+makes+me+happy PDF link annotation
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae747e2331---todokilitisekazunemej.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/3c530a733e537167208646f5abdc410a/57311118676.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/tekekidufazot.pdfIn PDF document text
    • https://pavimenti.pl/web/uploads/files/jevulufibavopapixaxalos.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/73ld0l9lb93419ri3jkqcmi737/95628679310.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents//files/nijalaxagalugep.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/bevabizarikafusesi.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce08d8e76f---kotozidinipugix.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021052521221885.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/716aa618b0262a0ac6fa5e439471e4cc/2682257783.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/98606624077.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/famutuzimozamukuw.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16072d19d8c4c5---74301563416.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/jegoparotexunuputiguwesak.pdfIn PDF document text
    • http://espwireless.net/uploads/file/xonokejatujare.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/pupaxipovojek.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/delojobomoxexov.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bff4a57dfb---rirazujoxipubonolosefuz.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/e1cac857359873a0e409b1a489cbfc20/70631309676.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754ef39ce76---pelifoxiderijoburat.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/f39092fcd8fd4fea6880247879268846/92243113901.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/44840825102.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_off0000ebef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEF 10460 bytes
SHA-256: 45daa04aea2c708c740aaffde2cb48ba44bfea003f12f0a411bdb2147a13afe2
font_01_sfnt_off0001038a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9C 17652 bytes
SHA-256: 0f7258aee654a49be1fe6fda69a658efad5e4843f984c407b6c5c9858c41c479

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