Malicious PDF — malware analysis report

Static analysis result for SHA-256 96fa283226ff8576…

MALICIOUS

PDF

73.6 KB Created: 2021-09-17 00:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 563fb7a230967245d34a1fad35798ead SHA-1: 90489ad73d1247b7d16d85a21e1b03a0d1ceb054 SHA-256: 96fa283226ff85768e764d641b1b21cb9b42debdb92d4c8b1c8d2710df8c204e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, forming a link farm. The primary purpose appears to be directing users to download content, likely malware or unwanted software, under the guise of providing free downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 https://smidgel.ru/uplcv?utm_term=minecraft+free+download+latest+version+android PDF link annotation
    • http://divyabodhanam.org/userfiles/file/xokisuwaraz.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/jugovamajikijir.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afc264f23d---88903216285.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/36063718803.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/lodibokitariga.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/bujitolaril.pdfIn PDF document text
    • http://teresachild.com/upload/files/susizoxuximafamikuwolelil.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/85428193155.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/88993035272.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/zusivobif.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/wekupiduzejigopuwutadex.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/sotug.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/80731804968.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc6c625f89---tupisabisuvixipofivuwi.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/29308279299.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613da8fd5904b---nirarazati.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xaduwaxofewawedanevupi.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff21b49ad9---65249646778.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/kolonenetupupi.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/63443980870.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/40322531081.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138ee883f3c1---dipujovutasumavijivew.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/dixibotogipi.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/vemigemefosekimisotira.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/15197021668.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/79665416856.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_off0000bf01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD713 15864 bytes
SHA-256: 9d22e8b4fc5368ae5cab62dfbb7e88e7d534f833d8a61dbcccc05ac5252da09f
font_02_sfnt_off0000ff9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9F 10612 bytes
SHA-256: 0930eac22a4b091032ece6eff7ed816a52b5c0a6917ebb35d67646159e7e9ff8

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