Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c316cf0253ae318…

MALICIOUS

PDF

85.3 KB Created: 2021-06-30 10:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ced497216a1ba970064019ebe3938db8 SHA-1: 6890f2d78facba980a7fdad2eab2ad2ffcd303b3 SHA-256: 0c316cf0253ae3189212967dfd318df1102cc0ae80480d4858bb800a1e141435
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted, but the PDF structure itself facilitates redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://smidgel.ru/uplcv?utm_term=excel+the+pivot+table+field+name+is+not+valid
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/552743cbbcdd245fc13187c50f0363a2/19188198142.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/c0a3df0e10ece2ce9f46b7761079fb3d/bivusog.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb73d5f26e---fobivirabakegepefumejex.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b301637cf2b---kevopadufeb.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/ea3d675c632eb0a4072d5b84f0ee47e5/60124294375.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1a36203f4---24252360380.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/0e093304672f1b8456ded1faaea56a41/doxosizakaguwalevevaxo.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e88599897---53786140131.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e5ivf7ckoi3ri8okolifmaeii5/miwirezezaxawajit.pdf
    • https://agmatbaa.com/upload/files/pokurogojobifu.pdf
    • https://aspaeng.com/files/image/files/18562147299.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7b378d4e8---mavepanebo.pdf
    • https://nffcd.org/userfiles/files/dofifapaliwumutebusixi.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ac61a02b1---99745276070.pdf
    • https://jotekonybakterium.hu/userfiles/files/wavelojomixewelikep.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/60jnnfnua1crl05ioau86atb1g/7368029450.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ah4nojc0l165cgh61b4p2heq61/felagilemexe.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826ea6846df---63232618905.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/7dbfdad912a9685b2f4db9c475ca0ea2/luxarekefunagafotisuvele.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1faeda7921---27260866270.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/e3a4a2e7dbc8781491dc48f23673e606/51561334285.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_off0000e384.bin
366e9299d074a3baffb2412afb53159f829cc8fd941e5ef95d7e7de1234af0d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE384 19044 bytes
font_01_sfnt_off0001147b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1147B 16792 bytes
font_02_sfnt_off00012c92.bin
91e5d902811be86660763930f3093b59605d4a349f893ea80c90c8b7d0563d69
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C92 11076 bytes