Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f4f512b247744f…

MALICIOUS

PDF

99.0 KB Created: 2021-09-07 21:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 7fbc8668e88e15904db07da3a6fa5e3a SHA-1: 61685a99a74b69ddaeac2cef22188c7542e0c3fe SHA-256: 54f4f512b247744f699f74eab1bb90ae1200ec5603eaeb55024b739872117cb3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories. These links likely serve as a distribution mechanism for phishing content or further malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acfdccb753---bigopunuxa.pdf In PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/e8093d62a76e0a32042f7aeab9a4bdf9/89759447867.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210809195312_1333863986.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/797547ee1686307a1ccacdad11c1ed45/lefebodotasikavalomeri.pdfIn PDF document text
    • https://kristinanamaste.eu/files/95572404699.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/cba052221b0950f8052b3f31e34e6aa1/52087056259.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0b5cee4df---tugik.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/33243643126.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c299ad4f4ad---vajave.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/7dd0f380b8520f7d20d404ac1b746e37/tanujemerokiwekupan.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/99720239421.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/lomefawa.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210807_D2B300260A6CEA4D.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/tivakuruzifumake.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/jigejogaxunozipujagogi.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/64593076058.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c74d846c0---fusim.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/48942410.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/85090661503.pdfIn PDF document text
    • http://eternoohydro.com/d/files/77871387550.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/bomesakivimumoka.pdfIn PDF document text
    • http://hotechike.com/files/files/sigalunusamarikujanaj.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/rifawolenelekudunula.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/e7c6c43f533942003568743b3fc46377/78608564178.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/35221773667.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/kubewotofuvikireduwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=rccg+digging+deep+1-100+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13222 10356 bytes
SHA-256: 3169464c0fdf49838eb1f935b473a99110980105a12c7539961452ff93378d85
font_02_sfnt_off00014970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14970 20080 bytes
SHA-256: 753295ee3cb2ddf50d20554e2e6a9a1fa0fc7e84bc1225ee3f782077047ca5c4

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