Malicious PDF — malware analysis report

Static analysis result for SHA-256 957fcbff67f572a5…

MALICIOUS

PDF

90.6 KB Created: 2021-08-13 16:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 44013c0c12e922f65093c303e614a79e SHA-1: 7f510cb4c42a83f3fdc0889610068cbf34e4c552 SHA-256: 957fcbff67f572a57b1c2bd753d8f3b55f4323353b0fcfecfb41fe92798da384
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting domains. The primary purpose appears to be directing users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://misbahelmudii.org/ckfinder/userfiles/files/sekavufizenexivufofat.pdf In PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee01d66ddf6---33930318417.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d05b0b6650---62444878449.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/famagiredolotivibaga.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/34975133281.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021080116222673499.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607910d690d6e---61974333085.pdfIn PDF document text
    • https://mavibusiness.it/file/70668333628.pdfIn PDF document text
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/97779426777.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/39924021837.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/lotesonidivadudapaz.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/d89f96f9bb672025b459c651e994b457/kimiximikekokiw.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/92721860825.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/67566911403.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/cf98fe85e68e7cd953cf798df33f2b3c/tuvavomoleruxadijosurumiz.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/4e25b85e04fdf3c247e0d2d5b5acaa82/lesudomiz.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092044908637---90948565931.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/bowawoxit.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/kezitetapapegusekimidone.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/n12m6kun6v89c5j12e48pghqo1/5646027075.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/rawewujukane.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/66007331564.pdfIn PDF document text
    • http://thepdaitruongphat.com/upload/ck/files/82460174.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/7m2kncg6tl4o2va9090epi1jb1/dodogagobatatoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=landfill+harmonic+movie+worksheet+answer+keyPDF 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_off0000fb69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB69 11056 bytes
SHA-256: d0ed725844dd102c7a5023d629c17cf2891a100a7d29e6632aaf88f724393c95
font_01_sfnt_off00011502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11502 17552 bytes
SHA-256: 572fa3c6ecebc38f55391ff23d326db6a2bb44438ce9f95558a5b4b382c28232
font_02_sfnt_off000141e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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