Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef3948bf071103c0…

MALICIOUS

PDF

71.5 KB Created: 2021-09-08 01:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 93800b654b14aceaf709125de251e46c SHA-1: ce968d7bb92e92a8dae62b8aade8d972919acde9 SHA-256: ef3948bf071103c06821530729fa2f4ab9ddf1799c345a3d084c71a8d1fe4b24
156 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress upload directories and other disposable hosting. The primary purpose appears to be directing users to external resources that likely host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/b9ed9d735f9dbdb6e8861e3522062607/bukowadagonojefixekumi.pdf In PDF document text
    • http://sosnovgeo.ru/userfiles/file/memolixovazawom.pdfIn PDF document text
    • https://tonitomov.com/picture/file/gakivivapipozi.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/58024532149.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-08-12-09-47-50-iXHH2WA5.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/557abb5a47065b6ccc3c982e3dbf995d/vafagorola.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021052914355573499.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/52540227830.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/83344676524.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cf7cf1ec05---58956511929.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/145aqp4vs4fkkqoapcaq7ts4hv/dobakopibavoxajovuxa.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713b6856764---nimemut.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1611d822ca559b---29970500837.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/v8ru124uanmm5ak1u19vqnpv1d/68521638013.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/46868485808.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/borute.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/48712124976.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16095d4ffaa6bb---50678268625.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/74346701457.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210715_1E6F4F703C08A21F.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/feredutozejavopivewuma.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00a9223763---lolirisedawitulotutadu.pdfIn PDF document text
    • http://firegallery.ru/img/upload/gopinivozaroze.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/78560778922.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/63227596945.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=breakthrough+plus+1+teacher+pdfPDF 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_off0000b640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB640 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE52 15956 bytes
SHA-256: 7c396152c60106b96f15f8cff555c0739648af6064daf215eb2af9f19b33b72a
font_02_sfnt_off0000f667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF667 11000 bytes
SHA-256: 2814f06a430fa221a4560776dc67e50e3661bfa1d7d8381ff191738a0b92d6b4

Open this report in the interactive analyzer, or submit your own file for analysis.