Malicious PDF — malware analysis report

Static analysis result for SHA-256 e942eb54b5050891…

MALICIOUS

PDF

84.7 KB Created: 2021-09-23 21:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c283ea5f77d9e1795823c81dc1d586e5 SHA-1: 7aeb605ec702f5854693a0447aa51b063bcface6 SHA-256: e942eb54b50508910965ef78e85f36999d952efa248bf589582e1a80d9b6c48c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. The presence of a 'download button' heuristic and multiple external URLs, including one pointing to a compromised WordPress site, indicates a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=idm+6.38+build+17+crack PDF link annotation
    • http://trungtinjsc.vn/upload/FCK/file/75460713037.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/25963926637.pdfIn PDF document text
    • http://e-photosynthesis.org/userfiles/file/22452847826.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/5906454880.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/14506921176.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/xuxikegejebaxisiv.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/punubaforupijifoxolikukew.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/rk6pu28b8gc76esa5dv7clnucv/jepimojawowapija.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/b2c9084dc01b84531fa0e7b0d12f9d4d/37328065206.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/remutofipobunofirapibev.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/9ae5cf9186ec9e9c0e1d86bd8f2a1063/50872362407.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/kelimurulupofe.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/retasugir.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/71980178212.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/17332561422.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109220245552276.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/jlnou8qjs9s6idfcg95tecqoh0/98282537059.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/885ee3f295cf5159352ba65e52330986/43895608579.pdfIn PDF document text
    • https://znalac.com/userfiles/file/lodajakovawuzazajijup.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/2272047312.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/30665834974.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/bodal.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/lunugutofafafo.pdfIn PDF document text
    • https://hssanesteban.cl/files/fitezeju.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_off0000e3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F2 18272 bytes
SHA-256: 78e7c5c8f1d9bf49d3c7e6f60576563c158ac000e742ab55aa44a51bd476937f
font_01_sfnt_off000112e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFC 10908 bytes
SHA-256: df5bb9c03565c887e5e712cb9fb6de0b30fe0a2611955979406ebec6b54a8a82

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