Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d1d98d9be44d5fb…

MALICIOUS

PDF

80.3 KB Created: 2021-09-04 07:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 02d2d88e95f9ed5cd64a3564004be02e SHA-1: 9f3a398d4ace72b799c3187dd6014a04e6962d49 SHA-256: 5d1d98d9be44d5fb792694f936fb46d1dcf1397ad0a2efba60821790d50ab668
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious lure designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://hyundaiokla.com/uploads/files/79909884939.pdf In PDF document text
    • https://jagominum.com/contents//files/21302886016.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/74479873345.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/sikilazijapukakexugumexo.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe665287e28---33133320765.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9f69c6967---45332907881.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/32499573495.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710a3d84934---walujibetegikep.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/berawupukulozatefo.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/bc8jj007jgd76o5p2crl630ga6/fujinokivuviwizaneneligus.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/62bocb9pn9nkvmd0b0glkhl304/37257439786.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/n318i8bnad99stpguct2e30ubf/1576995118.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/9962196733.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609208105835a---23512465404.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/neketog.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/93516583517.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16082ab96a7cdb---26404839039.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/4mk6enfcu10kimtsv5757iv724/44528580686.pdfIn PDF document text
    • https://tadimtursu.com/image/files/95716793740.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/98527939801.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/mimuf.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/lujowiwupalosugakaga.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/fajexi.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16089a2e4e9b64---85074281428.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/lemuzexavoti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=jurnal+jahe+merah+pdfPDF 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_off0000d92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92A 10504 bytes
SHA-256: 78d7f3ef179b4451609c85341945a4e22060ebe034db17fcc4a8651f9db74da0
font_01_sfnt_off0000f0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DA 16692 bytes
SHA-256: af07324e4548dc9b83e07d41d58cceda763adf4be201c0171f9212aa6cc765f7

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