Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d6442deedc37642…

MALICIOUS

PDF

91.6 KB Created: 2021-09-16 20:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4d7dc8c1de30f84ccd2069099fc42e2b SHA-1: 085f32ffc9205ed3f759e82b72a014c3449d6a41 SHA-256: 5d6442deedc37642b6be89ecf717bb071b86046063b576194ead93e8e3d1b923
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, while numerous, do not appear to contain executable content directly, but rather redirect to other potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://musicandyouapp.com/webupload/editorimg/files/voxareka.pdf In PDF document text
    • https://pmeds.us/userfiles/file/notuvigameb.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/51694985790.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/vevesu.pdfIn PDF document text
    • http://hoaphathotel.com/luutru/files/tajabokoloruz.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/45919938743.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/lexejunidezijitiwa.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/wanodurifavubaxefatofek.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2c9f2ab4a---fadelogediludaxokim.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/jonawav.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/nugejifojowanosifagiz.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/vaviseg.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/52033622575.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/xilawuzeruvofenabeje.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/62185078303.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210901_8B5409A74ECFFAB9.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/votidezuse.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/a06fd7beae84117b62dbe260d17bc1dd/sopubefoz.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/sapilegufatedefupe.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/3580660349.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/32556986312.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/p6dg3mglrjsqj2fe6kndfr52tc/purekoxomivokekufuwaxug.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210908_081042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=kill+team+rogue+trader+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B9 10660 bytes
SHA-256: 31b38c9cc30a7c3d8bf3bb58c11012c34454727adc55a4b706a447392108998b
font_01_sfnt_off0000fce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE0 18252 bytes
SHA-256: 59b136ca664b5de2f305f4a233b75ca2873a0b77b458e9a9e85cd792d108d52b
font_02_sfnt_off00012c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3F 18024 bytes
SHA-256: 027535a2509da5ee5e40df4c033ae726db50fa08aa50a5fb20c7018d8f128a0d
font_03_sfnt_off00014815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14815 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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