Malicious PDF — malware analysis report

Static analysis result for SHA-256 159150bedb32591c…

MALICIOUS

PDF

76.1 KB Created: 2021-09-01 20:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 980eaeabe1882e93d634192da69b5c43 SHA-1: fc2e7bc9be3c09649329528858f65d1e8443ba51 SHA-256: 159150bedb32591c4d7d7775bfad3d1e294ab1d6b5b598d2a3f97c8dc3fea4a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs that redirect to compromised websites, many of which are disguised as download portals for software like WinRAR. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to trick users into downloading malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://ketchas.ru/uplcv?utm_term=winrar+free+download+with+crack PDF link annotation
    • http://www.saito-ken.jp/userdata/file/15581692465.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/tuwonadeg.pdfIn PDF document text
    • http://tochuchoinghi.org/files/jurerebosewokudizoku.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/d89151c2633edf8ed3b004dfdeff04b5/dowakonenatipadobogogu.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/xepiwujedamomozelijapifar.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/11562962459.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/bisarovirurolinowasurexog.pdfIn PDF document text
    • https://fasleh.net/Files/files/25220810379.pdfIn PDF document text
    • http://adamshs-pdx.com/clients/d/d3/d3c120c733f7363e2cdaef2cff5f3687/File/84436238959.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/98943156333.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16075cae09bc72---xotokivi.pdfIn PDF document text
    • http://www.yt333.com/userfiles/20210727/file/1627391098.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869e2a3b769---23956937247.pdfIn PDF document text
    • http://skia22.ru/pic/file/43826672477.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/nn6qo6f0a70ddl56vjc9kjgt6m/filuxogewok.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/b85366b6121c9e86eb7b9e392e75dd7d/19680446231.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/fumatovibawalikiguwog.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/7242452366.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acc778f3965---rebanamupomupozukadigis.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/pulonikuvemafizaxo.pdfIn PDF document text
    • https://moscowfashion.net/content/xuploadimages/file/katetugorobemajasonor.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/bivuwezoxemilititavafuja.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/6860c6a0539d1f760f7ce05435ece5a1/dukemisojuwuzugame.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/tabekisumibobijekunutalu.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610433ace536f---viwetarowulixina.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608167f8adc5b---sawuritomexejirozojoga.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_off0000c63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63B 10576 bytes
SHA-256: 3c91635556772ecffa78c69d33eafda945da142eb0b89a920dddd2efaa97662b
font_01_sfnt_off0000de4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4C 16888 bytes
SHA-256: 87da1a22f6e9c2e9eace044b07de8f67836f832e923b77787955387f082905b3
font_02_sfnt_off00010a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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