Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f6578c9e100b6f6…

MALICIOUS

PDF

85.9 KB Created: 2021-07-12 16:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26d475481628a3467339ed1bb489bee8 SHA-1: 8eadbeb0dc6a26528789f7cec2de60c607ff4852 SHA-256: 7f6578c9e100b6f67f7d608ffaaa69cc2d9789a41eba519a4e41a6264c53927c
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links to compromised websites, indicating an attempt to deliver a malicious payload. The presence of a visual download button and the use of link farms on disposable hosting further support a phishing or malware distribution scheme. ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 8

  • 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.
  • 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.
  • 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 http://myredm.ru/uploads/file/33390028367.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/ddc01ab98c936b94bb628eaa4935e014/58975145767.pdf
    • http://medicare-darmstadt.de/bilder/UserImages/file/dakefuxagulajapotuzug.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74d427e783---mafitipemola.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608777c083d1e---ribopuwagoparibegedo.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5e1062e9d---dorixokotav.pdf
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/46825987366.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/6aa0654e8d8ce83b8eef2f98dfe9eefe/39010202305.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2fff661a7---94152273778.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e80ceb0f388---83429586278.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/9gdsvotv2ockghvb32900k77f5/sezoxagasujob.pdf
    • http://cycling-software.com/files/file/40166484482.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/0cfa593c960fd01b29b0dbc079cc9942/45654216822.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e97b91a985---59056091213.pdf
    • https://haysalon.com/public_html/userfiles/file/lexumulegasigufinefo.pdf
    • http://aimic.com/userfiles/file/98806335049.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/jjd61lq999cacao2v7ich4moou/pakodamolazoweluramu.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ecff81559---milotenewemananim.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/0d6946fe2b1e9da8209f2a21726566e9/93419782769.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c7983bfda---15430380630.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/6ec94259ae6dd91455447cba70e2dac6/63659746663.pdf
    • http://cjmjwarrickhudsonfamilyreunion.com/clients/9/9b/9be434dcd9982d5451de1b36a82eb828/File/domijapofa.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/a3gqfp6klgi33gclhce1rdr7v7/17110599501.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=real+cricket+mod+apk+everything+unlocked
    • 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_off0000ea92.bin
f7ba6fb65fa8c02be6d5442a8440076aca5957437c592f996d6948e57dfbe70c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA92 17400 bytes
font_01_sfnt_off00011857.bin
09c56807273f7ecc5d04adb66da93c3a23063063db8ba4035af5b075030418fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x11857 11208 bytes
font_02_sfnt_off00013231.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13231 16792 bytes