Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1653388c934d4c0…

MALICIOUS

PDF

88.9 KB Created: 2021-07-13 02:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: b58896687f3c2378b2821b33ad4e861d SHA-1: 96947ed6143dbc93f111418c03d96c4bc8b40c74 SHA-256: d1653388c934d4c05c2e61b053875f8fa23f9c4013e9a5451bdbe2604ac52cc9
196 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains exploit code. It functions as a link farm, directing users to numerous URLs, several of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution scheme. The presence of 'cmd0/mepebudiginubulojosol.pdf' in the document text hints at potential command execution or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://elitstroycraft.ru/source/file/67177039570.pdf In PDF document text
    • http://isgsrl.it/images/file/somexazevivapuxenajo.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/sozerevekuvixunomosujof.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/d26b73c75479feee076da56541f2620a/27553381327.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0af93df1a---sosevurajimujuk.pdfIn PDF document text
    • http://mfahk.com/upload/files/99066672668.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/38441687651.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/e7rcfb4jqol0ne82cv16baf924/rafojigadejab.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c09f5dc8a5---87917672061.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b068d1e698---30154945563.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a490d5db028---54416707774.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/tl5fa9jrmistcod482u09kcmd0/mepebudiginubulojosol.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/41f13e98eb382cdee3a30c8082127bdd/zenerumikiraren.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/64841563238.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e640ffccd67---bujom.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/tizuru.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/7616531497.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4f43df55ae94bec761adb33aae854c34/dagovojotinabatu.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/18188494653.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/pojekumel.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/befomo.pdfIn PDF document text
    • https://vieclamkythuat123.com/upload/files/6004444568.pdfIn PDF document text
    • http://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/9477414859.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/97801927211.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxoIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=home+remedies+for+irregular+periodsPDF 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_off0000f914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF914 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11126 17088 bytes
SHA-256: 92c6e29255f4ce5d3fb2dadc448ecddaf66e1a488d833867a305e8e378cebecd
font_02_sfnt_off00013dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD8 10732 bytes
SHA-256: 32356748cf2912f40cb08ddc15356d491e121e0c5a7a62de965ad75c46d9a261

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