Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b9b5c698b48d3d…

MALICIOUS

PDF

91.5 KB Created: 2021-07-16 22:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d65dfa2343e84c2c7ddd4a5eadce90eb SHA-1: cbc2a56e5f82d3a80714c45dd63082d977832341 SHA-256: 34b9b5c698b48d3d69f70bc37d42846d3390fba7ba090f917d167e7e853cdd37
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs and link farm patterns, indicating an attempt to redirect users to compromised or malicious websites. The presence of compromised CMS upload links further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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 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://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160961a2941cbd---67613554788.pdf
    • http://ghioroiu.ro/sites/default/files/file/botewod.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4e47e90cc---narezemoget.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16ee915ae3---rewozod.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d831080ae---91980962357.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098ac98861cc---jedejebozedefenaxujovom.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/29b68df2777bea58dc440d6b0f5ca45a/bulipunokapoduxi.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/38gt470681l3lvktvdi9f8pu4e/mupidopopete.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077dd3eec13f---7947336525.pdf
    • https://lensprovn.com/ckfinder/userfiles/files/69659605798.pdf
    • https://alatheir.com/atheirwsfiles/file/zazikuvovazitelesijufad.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b4c16c0fb---wajix.pdf
    • http://beachfirebrands.com/userfiles/file/18770650885.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609aba7c0110c---taretufukave.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/a7778ceeeccfe454f848222d7deb531e/nolemusajuvedopenumal.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c30d593b456---kobiberefovuxumujon.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d23d3484ea---47228077908.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf2a8d7a89---tazirokixekosudabeb.pdf
    • https://capecoralliving.com/media/file/47025457894.pdf
    • http://libron.pl/fckupload/assets/file/49609611470.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1608697cd6355e---fufalufetivozu.pdf
    • http://wskinbody.com/data/boardData/files/kajigotewatowifafofus.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=probability+word+problems+with+percentages
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff1b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1B 16792 bytes
font_01_sfnt_off0001172d.bin
1f35221e265abdb08b449025ac71f78e51ec4e2f030b289469fd74b70f97897a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1172D 17952 bytes
font_02_sfnt_off00014677.bin
439771140771f16bd657590269e71cdf351d0a0f3c6076217e3e921b63201488
pdf-font-stream PDF embedded font (sfnt) at offset 0x14677 11300 bytes