Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f76c09e82248c6…

MALICIOUS

PDF

84.8 KB Created: 2021-09-04 06:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 794ec0f9eb3ae25c3828e64a4c4e2009 SHA-1: 5136e662df54dfeae295129a341fac2a0b2e3cc0 SHA-256: b0f76c09e82248c6180bc0c17accd6e3318f529854a5ac20a31caaadda9a0bbc
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. These links form a link farm designed to redirect users to potentially malicious PDF files, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609294965bc8e---87848817521.pdf In PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/bff8d23fa283143b16a565361848c307/vitopikug.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/mokugajegabinoripikowaj.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/murumu.pdfIn PDF document text
    • https://medius.sk/userfiles/file/papibuzijimo.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160ab66fce9d05---64246546280.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/51000510985.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/52566740316.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/lovolakodadezekimokividuf.pdfIn PDF document text
    • https://camelcarpet.org/d/files/gufedek.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/wuzebajugemumowiberanogo.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/mapelewegixemupunuti.pdfIn PDF document text
    • http://klientskazona.radeton.sk/ckfinder/userfiles/files/loluzotijanimifomipe.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/bopapu.pdfIn PDF document text
    • http://airsoft1.ro/files/file/makiluwezufumomesaxibam.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/pifeluzenatozonev.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/11674858817.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/elig580nb14slmu9peho38vj76/95780943933.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/dd6f9580d611f140313c60ed9c507127/kerarefo.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/82177e84d08186da4e79cb704e39d6d6/10843196396.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/455802716.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/vekebafuzimesolaf.pdfIn PDF document text
    • http://darec.sk/files/files/gigovibesenuge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=phantom+comics+free+download+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_off0000e6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EE 10972 bytes
SHA-256: 37321107c66ba06802a11a5102baba9625cad6a85e916732d6ec5a7b1394a651
font_01_sfnt_off0001003a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003A 17772 bytes
SHA-256: af9d31156c0f98951afa9cbcdc1101e2fd98b21791c1f15812b30f6ffdefb2d2
font_02_sfnt_off00012d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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