Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2f0e8b50ab4d09d…

MALICIOUS

PDF

73.7 KB Created: 2021-09-16 00:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b16e918c046e86a49c9325a269ec939c SHA-1: 36bc481f4efb95d9655fd3d6ca5019728392038f SHA-256: c2f0e8b50ab4d09dfeeab3a26dccbbb634d4b899dab4414159c7b686d814c3db
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis suggest a link farm designed to leverage compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://glaze-metalart.com/upload/files/laserumaferajexifizelesob.pdf In PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f87dc92a70---36410671245.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/nawudaxatojazorukoranad.pdfIn PDF document text
    • http://ch-yang.com/upload/files/gugidoseke.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/kelisavidapevusedajizekit.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/fc0c753d3cdffd3f07d42ef206c2d32e/zaxelim.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/peporiwodatabanoda.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133b577d967a---loniposo.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/id1kjr4ddu4bus496f2j8cdm7k/jobuje.pdfIn PDF document text
    • http://zl369.net/userfiles/file/koxasogo.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/lifodatumogaxi.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/vojokimozunomopaf.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137f9094efaf---suxasataderera.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/33142392823.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/pigiv.pdfIn PDF document text
    • http://artdental.hu/editor_up/pasazoxobemaxinigudolis.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/gumoxagijuguzi.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/14660522083.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/jadedofanosagikomefabe.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/werovevadirapex.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161302279ab9c1---80247576700.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/7e569ad99d8df238ce3f1b3273bee2ac/pifujoredamezag.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161321c9d8dbbf---teroxiniwitugevaraw.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/vilid.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/89207185543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=smith+organic+chemistry+6th+solutionPDF 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_off0000bd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD17 16104 bytes
SHA-256: 942a1c0a15e5ac24b9030200dd5e97704f718cb61370598ebf136ce69ee42ee6
font_01_sfnt_off0000e70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70B 11132 bytes
SHA-256: 84ac1654506e2e24472d7cb634c64a8ec3fc1b97925a0df9165d25a8b276dbad
font_02_sfnt_off000100e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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