Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af5d5fd9a0ba387…

MALICIOUS

PDF

109.2 KB Created: 2021-07-08 01:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 16d02579b59bdf4c68092ea9db1b59df SHA-1: defadbbbee44aba23b450b3763df5f258c6bbf4b SHA-256: 0af5d5fd9a0ba3871e8b9e78a69ae0c85db0fe63573bcb0aeb0462ea1adc99fa
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to host malicious content or redirect users. The heuristic 'SE_INVOICE_LURE' indicates the document's content is designed to trick users into clicking the provided links, likely for phishing or malware distribution. Although no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://madmojo.com/fckupload/file/11129868657.pdf In PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc770ba79f2---63498319759.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a895cb55dac---30914036876.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16088a40f4a157---sidusaf.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160769740f41c7---fufemadesum.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf29bead51---26211574933.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/nirepumewozetokejepunox.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/eca00705ad9679ddd974952df5f4992d/telitifolopetalanisulu.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/31785998860add459b6f7f.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608356ac937b8---65039453059.pdfIn PDF document text
    • http://praguetransfer.com/files/file/37452997623.pdfIn PDF document text
    • https://area5srl.it/file/62442884679.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dusoki.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/27719261336.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/54101596758.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a03972d0581---robuvugoze.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/80011825459.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607249461c85f---tazele.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e400be173b---luvos.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/df71a0l9cigilpujm8hpnrrl2c/27805332505.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/72371222282.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=fiscal+year+filersPDF 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_off00014db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB0 10100 bytes
SHA-256: 8bd1fad33c616ac912b11892734658d3f389dffc9567109022e2a0634c5c82e6
font_01_sfnt_off0001644c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1644C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C5E 16980 bytes
SHA-256: 610fea7a7a63b3b3efd6da87c75a789f318944f4316e097d277f250da0c9023c

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