Malicious PDF — malware analysis report

Static analysis result for SHA-256 2267e716828b4dce…

MALICIOUS

PDF

86.7 KB Created: 2021-09-03 16:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 82f8f5521d43d4af75da38946bd2f435 SHA-1: 31656179b64e3c81d8fe950e323b7c2e4e229da7 SHA-256: 2267e716828b4dce9bc44aa259eeeb78d0b0c7b48f5424bce585a548c8a78af1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable domains, likely for phishing or malware distribution. The presence of external URIs and link farm characteristics strongly suggests a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://inwebjor.ru/uplcv?utm_term=triggers+sql+pdf PDF link annotation
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/71402514c90a553cdf33c0cf331486eb/78062898150.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210827_B2617082643AFFC8.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210627151716.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce0af2dc83---limukivizonotogekatatu.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7b3fb16cd0a7b215dd7e1f9c740a0f37/funuxoxeret.pdfIn PDF document text
    • http://eternaseguros.net/files/files/47615692921.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/vijujogagotiwip.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/2e290df53daf69771b5c6cd4cca82b30/60684709559.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2f3c691e4---8444872797.pdfIn PDF document text
    • https://tycoonmarine.com/userfiles/files/pixasigupegekixovosoto.pdfIn PDF document text
    • https://alutat.com/data/file/jaleja.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/pebonat.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/zonap.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/46da4a024612e27e3d9006dc0bda3415/tonejuwu.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaeb3dffb7---keliwoduwepuwikum.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608848226b1db---23512338953.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/1855654529.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/xobaxa.pdfIn PDF document text
    • http://jpcadonate.com/clients/4/48/4863a0bac697dd4b44f4a1b1fb44835f/File/redufoxas.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/revedofekade.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/acdc21b922b38e37cbc779ec9479d7c5/mutiwonorimitadonan.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16081201482bab---mepaxexaketolazusodevadu.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/82df06b5badaee2d06b0223fe3210d71/99924965945.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_off0000f1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DF 10296 bytes
SHA-256: 8315e1416e723e8773d2dc37f5c5ed774e9d61686b5c2bc1b193c98aa8a703a3
font_01_sfnt_off00010883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10883 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12095 17136 bytes
SHA-256: b1d36957a2bc057d1ef15f250bf25fba152a1e3d413a9e50ce313df803d9c48a

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