Malicious PDF — malware analysis report

Static analysis result for SHA-256 40941fb3db7f4b79…

MALICIOUS

PDF

87.1 KB Created: 2021-07-02 05:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 289ecf24fc6ca58b7318b02374093cf3 SHA-1: 6328f32b13ba1d6cca1d1adbaab7c8462fc9d519 SHA-256: 40941fb3db7f4b796103b4c095616e3f650ea29d0bcb1347a99b64da12e1a4d7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://maasmartcity.com/userfiles/file/59966464517.pdf In PDF document text
    • http://greenplanetnepal.com/userfiles/file/kusubisegufosola.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/41775136244.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b311ce665---63694187923.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b757a6f0689---detojuberalinebo.pdfIn PDF document text
    • https://777mto.org/contents//files/98447348279.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f7280d5d0---73895354725.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/24922399014.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/4100843068.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c3791a55---96376767178.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/poxon.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///36997310591.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe5b80b510---68247280339.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/bf79b9b3adaa9275ea5c4f0ac98394aa/85067400000.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/055de5b7a7c2810879c96ac6e413988b/46307839564.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d025467998---wokevesovusogodosilosib.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b58f376fc24---badexafefatak.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de0a44dad6d---47515676466.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/99092460182.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/56993786176.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/gubalogizalo.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fd00a9609---29556584361.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/fusisunotipupafagetalet.pdfIn PDF document text
    • http://cortabellanews.com/userimages/fijusiwipekuvonilivovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=define+by+and+byPDF 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_off0000f344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF344 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5B 10068 bytes
SHA-256: 12ddb470174467a75fed370562433f3bb2e0cd68da760b38057eb1e5af68e2f0
font_02_sfnt_off000121de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DE 16968 bytes
SHA-256: 8faca940ae78a9c14a24c07d399c0a6aca5ce8ef10f3f6c0f2ca32c9b1e5d734

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