Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac28a40b19cdc05…

MALICIOUS

PDF

83.7 KB Created: 2021-09-13 15:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: af49dde8bd165604acccbc19e0590387 SHA-1: 1bc1e6020b55dc7da506dd4e6983fe53d6fcdf66 SHA-256: aac28a40b19cdc05cbcb6709bc2b2985e64edfc46c0657a805fd697ba659d319
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to other PDF files hosted on various domains. Heuristics indicate this is a link farm, potentially for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier flagging strongly suggest malicious intent, likely related to phishing or malware distribution through these linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://escuelasfutbol8.com/docs/files/45938155445.pdf In PDF document text
    • http://verypool.cn/images/upload/File/3823097463.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/sozonakadejitovefaj.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/malifekapulitowogetiwiso.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///bepovetelifosufimevisen.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/45819052494.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/10959541187.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/a9f9b8769118946cf2d1f064d44daf8d/xabuveguxogopinufe.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/vaxaguxigonegerun.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/3a95af2ea867b6d7e56f534b2b035fba/5020317594.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/morujar.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/puvagapimutuwologebiwebid.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/bitowem.pdfIn PDF document text
    • https://empresa-venta.hr/files/ganogivinuxej.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/debigekawanajitoga.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210909_055150.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/tikuwimitezidule.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/5635953636134eb0b3910b.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316a1c96455---dokagu.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109100103014351.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/39711864669.pdfIn PDF document text
    • http://ladna.pl/user_images/file/ximafuxojagomofujapad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=it+follows+full+movie+download+480pPDF 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_off0000e1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B2 17500 bytes
SHA-256: 7a7e63d50029ef83d2d8d80558799cd0e5dab64ccaaa87fa83245431a9ee4d68
font_01_sfnt_off00010f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F03 11168 bytes
SHA-256: 7a0c34dce6615afb41a96518d7083c032a998ba074b39b4be07bc9559216a413
font_02_sfnt_off00012934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12934 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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