Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb96452c80c255c…

MALICIOUS

PDF

90.0 KB Created: 2021-07-19 03:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a5b8ea366fd0476f9fd89a592cdaea41 SHA-1: 29f494ab20a48dcc7e6a2d93f39abf6366b0d911 SHA-256: ecb96452c80c255cfaa1b23ad27d4043b5afc739f6e4d3765e882a6d7f668464
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://arvikabc.com/images/uploadedimages/file/bozejedozax.pdf In PDF document text
    • https://arerp.kr/data/file///xutodaxoperirobezomutuwa.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/0a59b850269ca0064a7cc5f43625cb7d/vowikiwigepil.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/58672057800.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d49852dab---binemekegon.pdfIn PDF document text
    • https://incasur.org/temp//files/4927700934.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bc9a79913---dararilotogedosedirosuvil.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/31452486610.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/1db5bfa12bf172cf960f99c6208e2e29/60263376785.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/8f0f5627550ad79811543fe922137d0a/gagisotawanut.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afcff0890b3---jenuse.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/3150638819.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6d7096673---vagitafaforetari.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/71534686489.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/40292170724.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/85925600846.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/galimamona.pdfIn PDF document text
    • http://k1a.ru/images/files/file/83833867082.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/pamexuletelerelerubidef.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/89056754623.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/25612809329.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86fcd1a03---gagefi.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/2740834919.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/silebupope.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/6b3f7e764eab329a12fe2afc7304d31a/81318677727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=what+is+philosophy+good+forPDF 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_off0000fb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001137a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137A 10648 bytes
SHA-256: bda0618eea481727f6c78e26d18a7203cf865e125a6dd8fdf2319a42831ee2a5
font_02_sfnt_off00012bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC9 17360 bytes
SHA-256: 92c981482c4be7bf28b5e0247694dba24794ae56ab140025124bdac28e1cc6bf