Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4164e8b4bfffac1…

MALICIOUS

PDF

78.6 KB Created: 2021-06-29 09:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0342bc1df3a17491fd91bf0e91708d17 SHA-1: 7e4541bbe5eb41701b426715c270be29f057bed2 SHA-256: d4164e8b4bfffac1e0d84bdcd288a431cfcfe98ed35f7300c7e24bd6f17e0eeb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to direct users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/449bf01809b07e35e5e0cf9dfbb7ff14/5778853072.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/5091c44b954025418a5daa6741b177a7/76507407157.pdf
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/neminopaxarosujidonezo.pdf
    • http://happysmilecard.com/uploads/files/89518555473.pdf
    • https://locoffice.ru/userfiles/file/47265481778.pdf
    • http://wsp.pl/userfiles/file/ratukexunotatedakex.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/38844840250.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160980a154c5fc---23174614615.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16070552fa089b---96445513767.pdf
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/0r8ju2gchp55r6p3qa8s0rirov/mukesefikugovogejaloba.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082fa31adeab---kazolademamex.pdf
    • http://wonikqnc.com/upload/editor/file/1624295579.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86a2286b48---62986974910.pdf
    • https://ajitcoatings.com/uploads/31371523995.pdf
    • https://ceccarbotosani.ro/userfiles/file/dunatilegafoxakotaf.pdf
    • http://g-shocktou.com/user_file/file/zemugubabaxot.pdf
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/6260502423.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/4a89a663f3cf6dc04b7071883fe44560/4214322775.pdf
    • http://alnoorcity.com/userfiles/file/labugepemojuxomaloxabemup.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160800cb255205---zikukodofexeguni.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/ro61hl99jh9qkdftgfebjr3rch/31618870521.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/3014a99242b5e6fcb51860087331d072/vilixog.pdf
    • http://tara77.com/clients/46590/File/faxilidobenatinobowevat.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b457d0786f---vadofijamuremumop.pdf
    • https://maconlux.lu/userfiles/files/72680009823.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=sight+words+tracing+worksheets+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdb0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB0 16792 bytes
font_01_sfnt_off0000e5c7.bin
807a37fc4866701096f1f0a6d08b2c0c5aacd13aae6367f03e83a1b10597470b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C7 11104 bytes
font_02_sfnt_off0000ff7f.bin
1bcf2cdb05f517c9a6ae8fce644686a5f269bf8c4aa45f79f0d670743de454aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7F 17656 bytes