Malicious PDF — malware analysis report

Static analysis result for SHA-256 9476237b97567014…

MALICIOUS

PDF

102.5 KB Created: 2021-06-26 23:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5811e155c97e146f4fb5ac11c819c6cb SHA-1: 15aece2cf911c921b74fd4792dd98ce8c120aa8d SHA-256: 9476237b975670140f472f7290cfdad4b4ed1dbb7a08aad327a45ff566fa92ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external URIs and links pointing to various websites, many of which appear to be compromised CMS uploads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as phishing or a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160761712096cb---24044220533.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16076fcc3182e9---91787127229.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cb011c20e---dujizejusefuwazuvovazuki.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7he7s3rfm4k764dbsuqjq0gbr5/vofukobakemojedomowisar.pdf
    • https://binarbaidequipment.com/public_html/userfiles/file/19822832885.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad185e56e26---xigelesekapibofizowu.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160755c8e52aa4---bapux.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160770724cc010---norira.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6bf583adc---sofubapevofaxigajule.pdf
    • http://capmar.eu/userfiles/file/tudolonarefaxajegitoku.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cab76dda9---44653482047.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/aef6b9109d8823f9187656255f8b31cb/51885092561.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607223f4aea8c---likoxe.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e9948d607d43118445362ea5ba0f2ee1/16415013057.pdf
    • http://perfekttorun.pl/pliki/pigewenasivaro.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/b51d33f3c4f51332cd8e8b515f1bb430/19519288181.pdf
    • http://www.toeterloeh44.de/files/79211614871.pdf
    • https://alutat.com/data/file/zidimiburakobubetokosag.pdf
    • https://666666.vn/upload/fck/file/gidisotonizawebedefakufam.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c7400ac46---18342417706.pdf
    • http://beytarimcilik.com/admin/editor_resim/file/pefimukutarugotigavizavef.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087e4bfa92d6---jidomerozesovuwexedazixe.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3a723da2---63839199759.pdf
    • http://jorkurojus.com/userfiles/file/remogesi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+art+of+worldly+wisdom+pdf+free+download
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011434.bin
de798c2dafa62601de4418e497569523df1695a0d88e8112fa917152648f6545		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11434 16424 bytes
font_01_sfnt_off00012af2.bin
9d125592cdcd4c95a16d0815706a818c4206560f30a961d5f6fb31892601c204		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF2 18328 bytes
font_02_sfnt_off00015a83.bin
904d8e868430b8fece9e18923f453e803568a28beedcb564db82ae2cce20ab29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A83 10924 bytes
font_03_sfnt_off000173b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x173B8 16792 bytes

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