Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa0aecfee059a78…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 14:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1ecd912de50da21d5b48f1527dfca4d6 SHA-1: 93eccfd6ccec9320f2a864fde31b79f2a194de55 SHA-256: aaa0aecfee059a7813937d2d99d2b9fc6aaf13489f437593e95e657c9482bdf3
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The embedded URLs and the nature of the heuristics suggest the primary goal is to redirect users to potentially malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://archism.ru/uplcv?utm_term=going+clear+book+pdf PDF link annotation
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/25365431057.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210912_3D02256A928D94FB.pdfIn PDF document text
    • https://proxus.nl/file/67858461520.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/34332299771.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/tepafevejamumije.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/majujeboxupalavevugosuvis.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/pidegapukew.pdfIn PDF document text
    • https://zhansq.cn/upload/file/tojatuduwepidurimexegari.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/36163133125.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/vilokorojepivazabopenin.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/cf08cbc00619d895422faecf07e97ce5/68237306477.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/levogefuwajozumimu.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/nelokinixofevab.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210912100806.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210908183257.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6dabd4d88---84645874173.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/davekubifekona.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/6af5420094f24ce3393a38e33d74c59c/watatexu.pdfIn PDF document text
    • http://ildong.org/sa_upload/userfiles/file/20210904171811.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/54123816204.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/subiwilepatuwuke.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/rurebikuxovivoru.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/64810490222.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_off0000da9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9E 10800 bytes
SHA-256: 5561df663e076fa256a427131bb8f9baf17ab10a1980bfa2e1cd5a4c309c83c6
font_01_sfnt_off0000f32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32B 17512 bytes
SHA-256: 5aebfc61092d087af00bc78004a235d8728045e2c471aa2f6e496b94658559f0
font_02_sfnt_off0001209e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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