Malicious PDF — malware analysis report

Static analysis result for SHA-256 8365765eb45343a6…

MALICIOUS

PDF

77.9 KB Created: 2021-09-18 03:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b360c8eddfb3258c08b2f8516b5deed4 SHA-1: d5799920c9f18ea7bf3364b821cc477059ef52b2 SHA-256: 8365765eb45343a630040a12f7ad95170a83502f4aabef3a5594babfe25db231
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://krisoc.ru/uplcv?utm_term=bridgerton+season+1+watch+online PDF link annotation
    • http://knipia.com/userfiles/file/xifajirarovefobomeporuxe.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1429c4bd7---2103689952.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/wezen.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/lowitog.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/zaxipo.pdfIn PDF document text
    • https://electroagro.es/pub/files/denobubufozer.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7646101905a74fe41bac3cc14afef0c5/16140959931.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/ratowadolebog.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/ledotisebuxamebifi.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ff3e103e7---dawawawaxekopavevaleloxib.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144aa58d3c20---61905999807.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/pefawokitaxifewe.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/68680202419.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613db2b4b26f3---76707836294.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/f0482c528656d4cee196c3a3f5e4cdf4/48622934893.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/32880879369.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/ludagupuwunolanovetumo.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/84203898338.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/89792581858.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pajagosakevabopefudired.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210904210501.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/25412656947.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021090808334373499.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/15697223394.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/gelawabamagakasixonoze.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_off0000c983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC983 17532 bytes
SHA-256: 977b59077e2033150bf472fd231de55b2ce6083335e5e3d62758a48ba4a58fec
font_01_sfnt_off0000f6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D0 10840 bytes
SHA-256: 7bd39169e2e99a4f2904bb7ebb17c99b3f55984ec8b3a067843bbdcf9ec64042
font_02_sfnt_off00010fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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