Malicious PDF — malware analysis report

Static analysis result for SHA-256 5598309095dd5389…

MALICIOUS

PDF

90.1 KB Created: 2021-07-08 22:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5fffe5676919297f641e1160d80f4882 SHA-1: a51a41ecd253ff27f4b1c0643659ac1ce582e910 SHA-256: 5598309095dd5389ced56bd300ebfed30f679c3f4a4bc342aa3b864b8eb5b7ba
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains numerous external links, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the ML classifier's high confidence score indicate a malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pistant.ru/uplcv?utm_term=lock+settings+android PDF link annotation
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/buguseratuf.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/49619443652.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/0igl7qpqs32mcg871i063oblhg/xotatumeredaruxejix.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/ramobaronitatotimeji.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/62539483460.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/54538528141.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3d7c755d9---wowosajemib.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609764e051c66---45118853207.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093d7ab95023---rarawumowelezomozig.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/27275242922.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210707_246F368DEECC0B56.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160afd67443e50---gisivijalarodimajuzopuze.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/80hc24bvm12easj2ncfa96n01q/46800262302.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021043004205873499.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/kijapabunosojusad.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/delimelimasadiwudiduxol.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/2893716903.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/5072855325.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/nirowikevogusuna.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d48825328---18860849538.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3820d7e4c---figorabuwabawagimuzumoja.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609170d2b6ce9---47160258475.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d2cb7ce85c3---dozejodenosap.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/64986638502.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160874b59c383a---86410277377.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d09d803d7f---48581259217.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE846 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10057 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_02_sfnt_off0001165e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165E 16936 bytes
SHA-256: 8cde4e250a7510817a0b13514ad186587a2537ac4c0084a386e6ca5cef841623
font_03_sfnt_off000142b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B1 10548 bytes
SHA-256: 4f9f8f0e0c09ff69b914c788b7ca287d83fda717572c3fa8b2e4bdddbbd9ce6c

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