Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf4a9f0bed9f95e…

MALICIOUS

PDF

92.1 KB Created: 2021-07-02 07:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d40e0c4da39d39425b05b2e5a3875fcb SHA-1: 2bd8c457ac27be5041cdccaf3ab5fa1d7e456135 SHA-256: fcf4a9f0bed9f95e42af4652b61544bc598643ca7f9c4aa4d43b27d141588fe0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/34bc77a4a7f213feedc9022ba397dc6d/tawuneverugatuwabebev.pdf In PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/55d80a2b02d9d9986b55f2898bbd1468/24311322728.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/vimuxanagem.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/409d13e5c721503ddb640698f5f4ee20/89127526439.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/jalho29r2f6pk5ahsapu64guc6/kedutewokawuxuguwufogem.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/nugowanifolesuxebatexaf.pdfIn PDF document text
    • https://ultralloy.net/upload/files/lidevufisotani.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e909a9b3d0---32159301004.pdfIn PDF document text
    • http://voijin.com/userfiles/files/bekabawet.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/tlo8rv2cj8shfurkvkhpmuuf3q/9964556982.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/tixelofegomarikokugolamuw.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092dacd4a8f5---zadepunimu.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5bd2e8587b---nubezo.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/69214752778.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/59599581385.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/5241905141.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/faeb574ffb40d07b7e94d1936798d4a2/dowawus.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/finudesuke.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/4601235834.pdfIn PDF document text
    • http://auchli-appenzeller.ch/userfiles/files/rawet.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/8be5esalc7756feo9dljo0kr33/pimejujifimapi.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/38f9ceaba194ddf94aa5c39cc43b6302/36126900348.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160c70ba3aaeba---xorusejazuwolam.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/7da1663ffaf539c4fc1d46e78fcf2be6/22594166231.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/4aedc459b1d6cd83bbbb7cd62de683af/pefot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=punch+out+wii+dolphinPDF 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_off0001051b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051B 17812 bytes
SHA-256: 7ebe0be6efba40806e26160239ee48f7fa633ac12828eb6bf939e66e2c940793
font_01_sfnt_off00013447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13447 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C5E 10236 bytes
SHA-256: b21d9503603c1566d25dbde6d082923427745b440dc059e0fcffe9b1bb05a1f3