Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ff5741b3b62bef5…

MALICIOUS

PDF

76.7 KB Created: 2021-09-04 03:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 17fcd99d8f6eb328f934ae33e9042743 SHA-1: 3d84d180547053ba2ddc1d7df2d691cd590f8545 SHA-256: 2ff5741b3b62bef562718a426de3997b0b2b9ca6c2b9729347b81e7f94918fc4
156 Risk Score

Malware Insights

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

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, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve to redirect users to phishing pages or download further malware, aligning with the characteristics of a spearphishing attachment used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d224bc4a906---zosixofoxurugomiginugexu.pdf In PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/98969355921.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609868aca4269---zevijiweverinez.pdfIn PDF document text
    • http://technocom.pl/editor/file/nudedojataxozi.pdfIn PDF document text
    • http://christopherdallo.com/file/lonorukirawilipowureged.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/33284469765.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a768288982d1d72130eb75d51cf62538/46252006935.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607434305f94b---88113526432.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/deterisosapep.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/10206783306.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/32828068732.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/mabutilelabewozu.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/3b674df4481a31ba691479e966fbd333/xofagasawuniz.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612558db25601---46540169009.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/8c44eae81fcb92aa72f818a81bff293f/wakasino.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/9253d459d34a1f7be416357549f102e6/dunab.pdfIn PDF document text
    • https://dintek.eu/uploads/file/43756308310.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/97190421838.pdfIn PDF document text
    • https://le27.fr/docs/file/82677265278.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/xikufijeguwekojijom.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/latutudavejatuzojome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=fundraising+invitation+letter+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_off0000c90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90B 16752 bytes
SHA-256: 964b0581b2b84e8fd229f6bb5ec9de70b9200a9468cc3d3e2a4786b4e72b976d
font_01_sfnt_off0000f40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40A 10816 bytes
SHA-256: 2ee8c82c7747abf8d3620e10fb3ed37febeb2d8f37e443dee2878c3c0e907622
font_02_sfnt_off00010ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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