Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eba41b4fecb9106…

MALICIOUS

PDF

86.3 KB Created: 2021-06-28 17:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92772f4295a7b99e0dd0578d9ea10393 SHA-1: 639cacfde3ecbfbf68338d9f61812f98e9dc00d2 SHA-256: 1eba41b4fecb91065795e990c551e0224ce074d09daa251b9c71463ee95ca3ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URI links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=expo+deploy+to+app+store
    • https://pnp-studio.com/fckeditorfiles/file/26489152379.pdf
    • https://keongracun.org/contents//files/9093679978.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/02ee4d87e50eaa2ab0ad65a89fa72bf5/6387124312.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/32a888c40ca018ca7ff6eec5c4fb9820/67918410777.pdf
    • https://medsplus.us/admin/images/file/rabunalavu.pdf
    • https://istanajpdua.com/contents//files/suverekidavijedime.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc86acebd7---fogeg.pdf
    • https://sindonis.com/userfiles/file/48690729054.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/c5061ecc9052c4f28a8401998bb1f44a/74392103160.pdf
    • https://ildiko-szepsegszalon.hu/userfiles/file/ginunovokegexeluzo.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6a68b0fe1---46846136716.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/2a32df65470883d5127aa4fac5f72058/ribejogafumufa.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/9815656071.pdf
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/0399c428deef91978b06912e8645e6fb/11402745228.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/c33b2acf4d47c9dc49cd974c2b662f30/fiwijabapesapenuluwuza.pdf
    • https://memoservicesrl.it/file/3237958430.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/dtbq879rnur63g9f4su5rl0c3k/1304197890.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/38jtu74s49k4gt2lt6301qg2jb/45031000924.pdf
    • https://adepotcustom.com/UploadFiles/file/20210508204955108.pdf
    • https://cambodiadriverservice.com/userfiles/file/1461028692.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/4e6f0e5958feb4cd90bb39f881c157af/8192304049.pdf
    • https://avgdesign.com/userfiles/file/banekejaxuwowevurirabisar.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_off0000ef02.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF02 16792 bytes
font_01_sfnt_off00010714.bin
1e1f320c4b440b7b0d27c5a01e84377fe12b63d54bd7da675b591af3f6ec4b32
pdf-font-stream PDF embedded font (sfnt) at offset 0x10714 16928 bytes
font_02_sfnt_off0001331d.bin
b9a2d02020542303cde7f6ab71fc6ac5ee0d33b89ffdbb0a8a1646a680c5b93a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1331D 10388 bytes