Malicious PDF — malware analysis report

Static analysis result for SHA-256 000285cfdef5ff55…

MALICIOUS

PDF

88.8 KB Created: 2021-09-18 14:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6af6a485ccf622d86778e6a9bd5ff028 SHA-1: 4d40fed32798f3e46a932228c0e5ebd20bf01d70 SHA-256: 000285cfdef5ff559b2bc45f9599309b2a863a87d57bebabf636bea8eaafbc48
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised websites or disposable hosting. This suggests the document is designed to lure users to potentially malicious sites, likely for phishing or malware delivery.

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 http://bluestandard.pl/ckfinder/userfiles/files/nixitulazuzomipiz.pdf In PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210917054756_eml2ZWRhYnVqZQ==.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f84a5a4802---belodozebebekazefeb.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/83876211465.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/rixewigikodagosuxemaleda.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/55859163485.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/xogumesibiweket.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/23816532814.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/24835645893.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139c2968b724---45212673094.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/wudupodifeveraxaded.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/2625d38466a58c1784fb30f70e3ff858/gutazuxakobisobusatogug.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/nivamobevezix.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/botajebagototi.pdfIn PDF document text
    • http://hak-al.com/resimler/files/61308287045.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/goviguronob.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459911e165a---73020287073.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/beranunoriwezimefajolop.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356f09ec469---71353122721.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/85532417595.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/54243618458.pdfIn PDF document text
    • https://atiksigorta.com/files/tumotuwozofisodalokebo.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210918/files/20210918054710.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/piropuvi.pdfIn PDF document text
    • http://speckrepej.com/upload/file/50145631370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=free+family+simulator+porn+gamePDF 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_off0000f6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C4 17484 bytes
SHA-256: 7a3c4d54a1d8ab1faa96a971dd6373c32328097468ace8805f2a5431adc19610
font_01_sfnt_off0001240c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240C 10892 bytes
SHA-256: ee2f84947cd2e522dd4377d192e47096e02d9bc8e028a3d80d3160d908ac881f
font_02_sfnt_off00013d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1