Malicious PDF — malware analysis report

Static analysis result for SHA-256 97cb25a00b428fd7…

MALICIOUS

PDF

74.1 KB Created: 2021-07-02 22:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2e7a2f27fab437ae828bbff8d5aa639d SHA-1: ad02819333ba1ee07614130ce1ae2ba4b067ec23 SHA-256: 97cb25a00b428fd7a8e1bd2a900391e13e0fc5e081b71ece72db5cb8c2c84db1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to external websites, many of which appear to be hosted on compromised WordPress installations. The primary purpose seems to be directing users to potentially harmful content, such as phishing sites or malware downloaders, leveraging a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://wastran.ru/uplcv?utm_term=foods+to+avoid+with+stomach+ulcer PDF link annotation
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/4b15f8ace583c55bd859d30b21e7dfab/61654577359.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/27324946009.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/39976866647.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/pulivaxe.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/pexazawirimapuvogizuni.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/5edc78f369e8387b57f90265fbe75c32/xumedakap.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d50f15b6a2---nubiwakepigibar.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/tobaw.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a21273ec007---bixeranaxuten.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/57543613016.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/0bb89815741149d293df07611a071e26/37198462011.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ec57a48e8---51038445457.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160724883c0cca---938288308.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/jakevorusubuze.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/74219222762.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/2136039399.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761f47b5957---makeborefe.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/i3rfv6a9vk5ntmcolc7bkgn7r7/dolebokikumedoxomu.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8fe703c5b---liviralameguwufere.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/texixex.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/dimovelawavufiroxumefevul.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/2mgcurfnmqru66r3jfbb0hq7c1/mereruwojesitijasuf.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/c6d3ee25c6f34dabb692715592ed0292/72840286148.pdfIn PDF document text
    • http://atek-ent.com/upload/file/wabepim.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/10nocii04e6j9m3um4h4hnb811/74353204711.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/videronetonofidevi.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_off0000c0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A5 16064 bytes
SHA-256: 31e2adead9f1068040a1665f17d86eda293c5d874d72a0ee9b85726d746cba83
font_01_sfnt_off0000e9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EF 10760 bytes
SHA-256: 3bce1f84f16cc68e172522b0e448943835683db15bdff538a0d0adc3f5954930
font_02_sfnt_off000102c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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