Malicious PDF — malware analysis report

Static analysis result for SHA-256 8520acc3e574d020…

MALICIOUS

PDF

84.0 KB Created: 2021-08-15 18:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f3aa4caf25b69a1d5813f726d233f3a SHA-1: 4bf27ea4ccbbf2e51ff07e4a5f69a3ff0c9c54bc SHA-256: 8520acc3e574d0202693555b20748cb7094986fa050b12b69747763deba93acd
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs pointing to compromised WordPress sites. These URLs are likely used to host phishing pages or distribute further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=what+are+the+four+types+of+playing+cards
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c6ba1aae99b660bdebfbda0dd1ceb873/benubobanonujalupogu.pdf
    • http://debandhelder.nl/ckfinder/userfiles/files/vekitonedumomelevugu.pdf
    • http://cy2hand.com/userfiles/39089546908.pdf
    • http://dentalweek.eu/userfiles/files/55168611453.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/9ff9718c35f879a08740f38a7a94c9e9/96439740259.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160906fa00573a---39454183004.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c25de5986ab---bugupuwivope.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084111b63435---55151877853.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/0a23fab375c9796c4a96a7a9a76124eb/23387246651.pdf
    • https://sunnyvale.com/wysiwygfiles/file/fukobakaxiginig.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d20724120a---10131028759.pdf
    • http://amphorabeautyclub.com/campannas/file/41981139042.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607653c3c4cd6---50765333543.pdf
    • http://cymrozgreatdanes.com/clients/1/1a/1a407d8ccac5525c71aaafb6b4664123/File/mibarikojusila.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/1e9d6497a2fb85f7c575ab4f007a6e87/46239644725.pdf
    • https://lawyerupsmart.com/tempimg/file/giweropimojiwiduxisor.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dcbaacea368440289e4777f12413deb3/48352501150.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e79f254db---suvibodapuxizozipokaniko.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/c7827964f3a13b719d8c31464b21d53d/virosorisiza.pdf
    • http://boxerdapolenta.com/cmsimple/images/file/lekelowinegufamez.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/9f5e2338d44ff1f1d8d2849802e172ab/79426407435.pdf
    • https://infrastone.com/userfiles/files/35807650071.pdf
    • 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_off0000e153.bin
2f7da1ea8b6c6a009ea1d04a9cdbb7eb10f33c9e14f8afe0edd29aafe1a90764
pdf-font-stream PDF embedded font (sfnt) at offset 0xE153 17448 bytes
font_01_sfnt_off00010e9a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9A 16792 bytes
font_02_sfnt_off000126b1.bin
781a33882805edf22d580c1197c9efeb998c8297c79ff9a38423d076b51bac52
pdf-font-stream PDF embedded font (sfnt) at offset 0x126B1 11108 bytes