Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2a747cc9dcc9170…

MALICIOUS

PDF

81.3 KB Created: 2021-09-01 08:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b013e7a0a73ac9f073eddc035935f245 SHA-1: 8e8525fb0d912a4d66bfd413eba9403af10b1316 SHA-256: e2a747cc9dcc9170eab61e230ec55182268b9a0ee40d2edcda16d26e0bf9eefb
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure as a link farm suggests it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/f098e7294a1defdb8bcc5dd7bd64e2f1/lukamavu.pdf In PDF document text
    • https://sanidom.pl/img/file/zizimugasiwalovanisuzag.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210801_3EA33CDBD47DCE01.pdfIn PDF document text
    • http://aimic.com/userfiles/file/22866786970.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090158d3c5f3---37258154205.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/76567133026.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/41144892940.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/dilipafamafujokotiz.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ko04cb1n06k366ei3b6862rpk3/zarovivebipuxeloxetegus.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/30474163406.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e2b9a6574---sofovasavawojojozoda.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/b0a0a356c6190709640c8089f6883f2a/27252130014.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/sitesusexevudikasasut.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/d248785603eb35eb5e0dc6b53f8d61da/kixelowuzukizax.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/17480934524.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/90758651997.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/favirijunijov.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e318f1944d---22667190312.pdfIn PDF document text
    • https://ottenburger.com/userfiles/file/luradagemebitopezarexede.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/7988944028.pdfIn PDF document text
    • http://sequoia60.com/clients/875776/File/6661442137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=famous+chinese+proverbsPDF 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_off0000c893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC893 23736 bytes
SHA-256: 35ab4d511252dff438f2cf90d9f3aad18479f65f47dbd71d925cab228209a655
font_01_sfnt_off00010536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10536 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4D 10776 bytes
SHA-256: 0214374a63dc21b673b257ba23835aa8f209ee4cd17112ffcbe16c48df3b1ef6