Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd3036918fcccc6…

MALICIOUS

PDF

71.0 KB Created: 2021-09-17 23:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5ae41d8850052dba8fb6061178e6e109 SHA-1: 01b706152015f6658461bb7a471dcbf20d4f6b52 SHA-256: 5dd3036918fcccc6ab90aa75cd8f31fde2bc460ec1963efeee0646eea92c384a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to lure users to potentially malicious content. The presence of external URIs and a high number of distinct hosts further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385fbccc242---16187991704.pdf In PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/nagufirugewavagito.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/petuluba.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/4041482026.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210906_011150.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/46053667403.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/dewisamaxemukil.pdfIn PDF document text
    • https://semut73.com/contents/files/45460504317.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/non2njqua37e167oldbd5cap28/tafukad.pdfIn PDF document text
    • http://telecycling.org/files/file/15567418514.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/13782201238.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/78643540166.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109090349199711.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/43740075734.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/ravanawivigijuduwej.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/aade642bd348f58328cf6b3b828852dd/9309879967.pdfIn PDF document text
    • http://fruitvita.com/files/files/retenofamigunope.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/mofalosabup.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/wevixutororinoxin.pdfIn PDF document text
    • http://szcftz.com/upload/regufupalizosexurepise.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/veo8r8p3t9tmiatru3os0650la/34700494060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=django+reinhardt+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_off0000aea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA4 19432 bytes
SHA-256: 27d4961e24733fb4d7fc66c35a73c3c51bdf7293c88d12a103dbb733095aab20
font_01_sfnt_off0000dec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC8 10696 bytes
SHA-256: 0a5db5fbc7f9133d3d20a63917925a4b5af9f73f653cf0cbaa459e52f5e8f977
font_02_sfnt_off0000f6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1