Malicious PDF — malware analysis report

Static analysis result for SHA-256 463be5ac453e55f1…

MALICIOUS

PDF

74.3 KB Created: 2021-09-11 12:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6348a2c0dfdcb98cb9e730d703994f42 SHA-1: 3114cb47f11892363b91dfce2307af2539022f51 SHA-256: 463be5ac453e55f12c0070b14e25d4db9ef78c632ec00298f120e89c69f986ea
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or redirection scheme. While no scripts were directly extracted, the nature of the URLs and the PDF structure implies potential exploitation or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/poicf2phil9g8q7ir3i1r9gb08/59597292825.pdf In PDF document text
    • http://saveursetsavoirs.fr/image/file/sunopotevavenogutekod.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/vorajogaboxotulelonud.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/fotitutofedilifewukago.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/wegoniro.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/rawifewikudifanufinizo.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/kidekipoxixuguwosotolise.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/tusojox.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613318fcaad5b---wesedosezotadebuw.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138869924a26---nipokulotenunakarav.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/vuzefonogewajebevunerogo.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/sijulid.pdfIn PDF document text
    • http://shopabrang.com/images/files/balunasalupoga.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/ruzije.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/31190660011.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/libub.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/54656618372.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/divawuw.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/79812671157.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/53780707273.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/32092504035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=fundamentals+of+biostatistics+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_off0000bd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD1D 17540 bytes
SHA-256: 577147b03c1de04ed8b34b8a2f25cdabd09809b3a281460d10c63dca8777feab
font_01_sfnt_off0000eadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADF 10900 bytes
SHA-256: 5ac90fbff4ad93d59c55509d23e9f794b79446e7bcaed11e060f2ecc29383d66
font_02_sfnt_off000103da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1