Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd823635e798490b…

MALICIOUS

PDF

91.4 KB Created: 2021-06-29 02:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f6925d91258acf03b2e1ac4fff73d65a SHA-1: c2ce60a221014a876df50b32e353b248ea68db11 SHA-256: fd823635e798490b7eda34e78a5235c59ea96ff0d97dfb142aeb1b8e77b2efa2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded links are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://beamstraffic.ae/amb/userfiles/file/zuzuremokuduroj.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/skkg1nss0eoqqmj5ibde7u76s1/2144845032.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32a4247526---bimosetevejinet.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607212b7206c9---34046823600.pdf
    • https://africanresearchcenter.com/userfiles/file/kikutesefinanukematurok.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ed0e42ef2---janujava.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/7534e8a51ab0d5394c9f88b68026b4ac/befuxarijipup.pdf
    • http://asesorgubernamental.com/images/file/vufepujuwabosuzusol.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/ed5d959f17be78aa6ea3446e0a9e6ac4/10445404061.pdf
    • http://tragiaocolamsapa.com/userfiles/image/file/bunusamiwa.pdf
    • http://elementsgogreen.com/userfiles/file/80956981083.pdf
    • https://stijsr.com/userfiles/file/ropijumi.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d9d57acbf---54005137304.pdf
    • http://anthonyvienna.com/sites/default/files/file/61512039555.pdf
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/nejeribavelugu.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/8a328d58c66f0a4df65f226d584a3609/54846509019.pdf
    • https://go2germany.ru/files/file/43329579657.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/86ieqvg511mumjgo7u9r103mm1/kadaxikunorakuviri.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/9eb0128c6f591e7fa90b4affaf2e6fc5/80857262591.pdf
    • https://hobbes-group.com/upload/files/77320696535.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1b3b3c93e---moxesoga.pdf
    • https://oklogistic.lv/upload/file/wadukidugut.pdf
    • https://licorne-hotel-restaurant.com/userfiles/file/15579799583.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/c9ce72d4d17704de3f3cd36f750b02c3/11777920754.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae7600798---lejiwelezuxa.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/c174d17fb419755bd24de62d424af9f9/zikesilomomozemirukolud.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=equation+of+tangent+and+normal
    • 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_off00010250.bin
aac30ff3269348ba9a189fff320c276565891f4eaf54f24fac06c4a9fc786448
pdf-font-stream PDF embedded font (sfnt) at offset 0x10250 17268 bytes
font_01_sfnt_off00013001.bin
c0c50f48cd1b5418c5c2749163139a13fe5df2ac493d38afc3df8595722ca8a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x13001 10756 bytes
font_02_sfnt_off00014827.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14827 16792 bytes