Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e483439e8a6a04…

MALICIOUS

PDF

92.1 KB Created: 2021-07-05 16:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d490d19920420ee0881b23d053a100fd SHA-1: 7488f7f4f9bdad1e1b1284bda990be1bc18add3d SHA-256: f5e483439e8a6a04fc2e7f27117c1751955b28a61c678b061ac17ff57c308e30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links hosted on compromised WordPress sites, forming a link farm likely designed to redirect users to malicious destinations. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to lure users into downloading further malware or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c635d4de90d---99077880713.pdf In PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/760f2c0165c07bd723503e1b028c54e4/natedebodupovutuz.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/76158715661.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6e4532db5---gojizagudotepopixajuveb.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/50749139918.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d4227c08a46aa1ee0cd2ccb2ac784fe5/fodolewudemubi.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/75c2c623464a46718e4e207d57755ad3/ladekexufim.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/2e9b7b6b541bcffd74381c0a17d5c525/57846952782.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c616618a8---lorakosuxadegi.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/c6a420fad1f655ab497afc3b2bea50a1/75337493085.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089ce310f3e4---fotipupaxaloja.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/d8a82cd9b7f42ade95a03dc8f7a5e805/5573596854.pdfIn PDF document text
    • http://www.centralperdana.com/file/wepudebisixa.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160933c8a0b2c2---21846578590.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/gafuribegamuvaraf.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/6685159594.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a292032fb4d---pikipe.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a819353f906---24659330798.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccfd8e63d7d---notibu.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/qioviphnc4ihtp9378gvfgruu1/ponifijoxofafuworitejuk.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16095f22ca6e41---dajon.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/cd2a75ce496833a14298ed4044d2684f/rosunilofajajilizen.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/80934898841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+dye+torches+in+minecraftPDF 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_off00010347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10347 10888 bytes
SHA-256: 8823c4f3d9d562da753cd6374a50ad6be5ac44f75099a14c8ee5ba0492bbece9
font_01_sfnt_off00011c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4A 17340 bytes
SHA-256: 101eec9302407b394d577143be7d437a087f1cf1ca251b8c9a64113919f1a5ef
font_02_sfnt_off000149b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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