Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5d6c2b0a00a11d…

MALICIOUS

PDF

114.4 KB Created: 2021-09-14 12:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aaa3bcdb88c6aa61ad697024979df199 SHA-1: 3c7f76e0e5d72e84d3189adc9946fa5a8342be85 SHA-256: ff5d6c2b0a00a11d8fa5b7df644bb86738690b41da026a443d36778004a67331
196 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics and an ML classifier as malicious. It contains numerous embedded URLs that point to compromised websites and link farms, indicating a phishing or malware distribution attempt. The 'SE_PAYMENT_REDIRECT_LURE' heuristic specifically suggests a business-email-compromise pattern, aiming to trick users into believing there are new banking instructions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://philabc.ru/uplcv?utm_term=iphone+8+plus+4g+not+working PDF link annotation
    • http://hitplus.eu/userfiles/file/jetavigiwuvawawatetovaw.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/gijakepovaritisosazis.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/votugomijotuvem.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/xiwupegewapakizukukug.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/98294125061.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/fuxes.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109091120554651.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/44242964709.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/52778847330.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/vibuwokinokiloluzim.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e83006e7c---72585722019.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/peluvedo.pdfIn PDF document text
    • https://morabia.fi/images/file/28556344244.pdfIn PDF document text
    • http://belstroyiz.ru/img/file/parukenalu.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/wogibufiwip.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/pozoja.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/6931033319b15a8d03b0f1c30a25a036/14692425004.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/guruwitepegalowobumabe.pdfIn PDF document text
    • http://modern-pro.ru/files/file/44109093661.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/libupakedosigewudota.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613dde262cee4---ditewux.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/778ce125847e22399119f3632a238f00/84736059636.pdfIn PDF document text
    • https://signika.pl/Upload/file/81864091484.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109090800208163.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_off0001599d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1599D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000171af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171AF 18472 bytes
SHA-256: 5188103b81a3f07d96b69438efc54e620ac4422b4203df569c3dac660e6b9109
font_02_sfnt_off0001a20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A20F 10884 bytes
SHA-256: 1f376520c3fbd00c484eec69ba4ec254fbff5a25962c2e9dacb4bd1330200f5d