Malicious PDF — malware analysis report

Static analysis result for SHA-256 07890a8efa4b71e0…

MALICIOUS

PDF

90.4 KB Created: 2021-06-26 09:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1d3ce05cd28733abfee2f8a6e5c435dc SHA-1: f36e41131bf13941da3dac4d740ee24d2a26d271 SHA-256: 07890a8efa4b71e052e55d64d161b38d43d24b518d0db5fed33cc89edc60c0c1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other disposable hosting domains, likely for phishing or malware distribution. The embedded URLs, such as 'https://pistant.ru/uplcv?utm_term=happy+new+year+photo+download+2021', are designed to entice users with seemingly innocuous search terms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pistant.ru/uplcv?utm_term=happy+new+year+photo+download+2021 PDF link annotation
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/7de13b85a1dc0cc6d62dcd5e271fd1e0/sufaguroboviputexupog.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d25cf96553---pezitezab.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/d226d3e0cbfc40cd8f7b131867c4097d/bomafavoruramug.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/8e87dd3b7730ca44a56379b6a8220d02/pugig.pdfIn PDF document text
    • http://elma1.ru/!upload/files/jiwux.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608873ba2ef9c---tasupezedolexiwexumazag.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b22ef64f9ee---21807341288.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cbc1ad3d5---78798505354.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/6235190083.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af3724d8b9---83208243447.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-21/20210621141535589442.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d85259d0c2---wosixuxuxokukogesuxix.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/6vo9duvmvagk3ntbb6amv85gsu/5731012332.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a269644a062---diluributikuvezazafi.pdfIn PDF document text
    • http://berbun.com/user_img/file/29330514161.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/soxigasika.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/a5df57c9c881e0679145cf3a5e5d8c63/tizurabozutunepudomote.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/korosekuk.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/bubovina.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083e4fa2d336---51558324843.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/7ui95e6uassdibb8i6r52cpp1s/14756319044.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/kopewikegupelifituneguso.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_off0000ff17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11729 17152 bytes
SHA-256: 3f2931628b2b4a8d3386a80f702340b1891cf57d0059371beb4c26f8c20590ff
font_02_sfnt_off000143d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D5 10716 bytes
SHA-256: 42b05d45a327ff1493a91d8015a0843086dcec1c400b3320f4c3eee671d2f765

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