Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8ff823d9076398…

MALICIOUS

PDF

155.0 KB Created: 2021-06-27 20:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: be607fd9bee0a42c6c76d96b3275fff6 SHA-1: 0d52f48a90eacc9b18288470fa632946d9796da4 SHA-256: 4e8ff823d9076398f70fe005e9121d468ea48e5f6ee389fe77ef39819977d9b3
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external URIs and link farm heuristics, indicating it is designed to redirect users to other malicious or compromised sites. Several URLs point to PDFs hosted on compromised WordPress installations, suggesting a distribution mechanism for further malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=wrath+of+the+titans+full+movie+tamil+dubbed+download PDF link annotation
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097c86057c96---18654706172.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61839346801.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210604021421.pdfIn PDF document text
    • http://kbchina.de/upload/filarakikalipodaxexanofus.pdfIn PDF document text
    • http://ibb-online.ru/f/file/xusagisesomegaripusijogi.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/0fv7iqu7v1rb8pa7dluv2des6c/66298334523.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/7s36gsfn0343rrkokhoc8aojk4/42758848810.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607290ad1fe80---lomevaditoguzap.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160822304487a0---faxaperovu.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/65cd41cedd799bb54bc32c7f18493766/3925164758.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/271aeb687d65c2fc630451f1fc4fae6a/lamawotevazufazemakifaf.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/8378327782.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/gakagafokipevexixalor.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0bb0efe5f---81480255807.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/35jfa8uk5ijudktq4el1sa6r5g/45324783246.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/9760b4531c087d081ebb8612edfe309f/didopi.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/64588677611.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2706e5d79---berunuxeniliweve.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160872dbdb9290---ferekukemido.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b113bcc6e---99362696230.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cff0819c524---24306902902.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/7f43d79cd90b0ed78c706b5dfa0a03d0/pifazetisatokagetifal.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9d645f407---44592216650.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_off0001e61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E61C 11004 bytes
SHA-256: e1c85a41e4b52797f7692ce1fae865abb75348639d06a24a383761b8027f58e7
font_01_sfnt_off0001ff83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00021795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21795 17648 bytes
SHA-256: ec9ced5d63bd208cc51c030cc9e868f0dfa6498858a5971d56368f213ccc77c0
font_03_sfnt_off000245aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x245AA 16728 bytes
SHA-256: 593baed78e01778d927a5536ced5b2263871ecc4bb7ee05fb3224ba0e8a9c309

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