Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e98c5385573caf…

MALICIOUS

PDF

135.6 KB Created: 2021-06-27 06:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d4878ef71db22d746f875ad0fe24644 SHA-1: e8ab84c2fedb8105e64989764dac70d80ed5c9cc SHA-256: a3e98c5385573caf5709c8a76f5bb69067def19ade34e5d33236b1adadf8b4b2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories. These links likely serve to redirect users to malicious content or download further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/b8b6775d7b6e1e32d2cbadd6ed22bdef/74232947899.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/9c6clcgd7hc5n8m3j4liapu9p2/tojolubabevatopuperido.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/o9k9lrjg2fu4gdfdm2enfp3uc6/31615280660.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/61614921ca9278ef37302d078ad2df92/42433046248.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdd20f139a---87787810886.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/126f281743c0e8ec875f0b56684234f9/zunefulogu.pdf
    • http://mywayrtk.info/userfiles/file/fojefifojezetikas.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/9erfup4es0u32nj8v1g9n0e0dk/xefumewojunebu.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f41255ccdddf7125445a36f26feaf92/bajamad.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/3e1a03315688d40d0a527e9c0d734b99/nuvuzuno.pdf
    • http://www.corazondelsol.es/ckfinder/userfiles/files/lopazijirevugozu.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/1b0608c4f38608f7273cb4e80eb9dc43/kufawe.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf057854cef---jisevanoxatuvoludujemogo.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/45s4igm7kjjc7km92n0givubl2/zebinanigodelojabalob.pdf
    • https://rosycaffe.com/file/208228443.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ea06ec540---16747935371.pdf
    • https://lawina-radom.pl/files/file/joxijutivavet.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/74385524570.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160840979d1a1b---xuvuxakekafegofasopusus.pdf
    • https://abhimaninteriors.com/ckfinder/userfiles/files/tapegusopulodoxeleguderin.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0bcf3900f---36127533580.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072cd9bbf020---letotavarivule.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/ba331047da84539d9d227640ac54c4e6/tegowi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=scale+master+classic+v3+2+manual
    • 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_off0001b36e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B36E 16792 bytes
font_01_sfnt_off0001cb80.bin
5ae85bf86630b24f09d1be2279293cf841fe2d2311258f509b00a5637c952e57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB80 16884 bytes
font_02_sfnt_off0001f779.bin
e1272427299cee8e536c75829679508c46c8d17a4f4ba0c48633d3d8e2e38106		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F779 10804 bytes

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