Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf627c29411d9ebf…

MALICIOUS

PDF

146.9 KB Created: 2021-09-07 05:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 037c4dbeff2587497b3f6eb23559c3a5 SHA-1: d09d36ab3f618ceef258bd463d6af12cd316c445 SHA-256: cf627c29411d9ebf8618876db82a42f924400235e2b8675880c1daec724bed04
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites hosting other PDF files. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious. The primary function appears to be directing users to potentially malicious content hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/oacjfjk42lato622nhm5gjp91n/xeniripadigoneb.pdf In PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/a4bu3campapmi7p7ums4rdl96n/vopelax.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/85802032170.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109061611303303.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/govomiso.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608c76858b223---gofefebivinigikureso.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/kekolomofadomeroviki.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b34f553f1---6146952633.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00f46d0787---kusix.pdfIn PDF document text
    • http://aa-nusd.jp/30589535317.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/jcfqjintkcn78tj22nm0s3qu4i/woponofibizusezivefe.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097d4b8d0ddc---gujagabudukum.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/11643258222.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/5ig1npjkjj7uqcrfcqc7035bb0/18223355577.pdfIn PDF document text
    • https://denimder.org/resimler/files/webewodum.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/u7bn5nmks4htc71gabmf7ai4p0/11546329326.pdfIn PDF document text
    • http://samsung-service-center.ru/uploads/files/lukiritofe.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/84393794202.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/xanunoxivap.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/i0t4l75hqu5kg1m9cl0qtv5ak5/vowukatum.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e16b3b36ab---74936897160.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ec337c95f---4221870846.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/kuvofegozijuzavepesekeg.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896fda17136---gutupoteje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=l%27islam+radical+en+afrique+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4d0e4849b7382090456d5234cf293b47/logugegejezudenaritaseme.pdfIn PDF document text
    • 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_off0001d503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D503 10800 bytes
SHA-256: 002834b696493635ae4b6912ecd16678e9ddcc45088af9dd0bf3187ebb277cf3
font_01_sfnt_off0001ed98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED98 22200 bytes
SHA-256: ba4d1c8d36b733418909d399b221bb86af213a90eb77bd42d9cf5759930e6a8b
font_02_sfnt_off0002252b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2252B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1