Malicious PDF — malware analysis report

Static analysis result for SHA-256 113e730f385c5c31…

MALICIOUS

PDF

94.8 KB Created: 2021-06-29 05:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be584d1fe6a1ee4993dc44419699a519 SHA-1: 00852a13a304924800d30e66c210d340a4025b75 SHA-256: 113e730f385c5c31fa87d5a977a768c34a0a45ae44d2f769c1e3d9c7638ae901
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and link farm heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/l7mpl9fi4g17ffak9jnvnkc6o8/42791488047.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/c57f1e20600a69623cb4b8631c8d87fa/pobujemokejiboxubuz.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160798ecf747cd---migilowox.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094a2ba64b29---15779749994.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd223a962a---14997216411.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607abd8fd6fbd---wifovizidez.pdf
    • http://drjoecarver.com/clients/49355/File/90397527424.pdf
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89359491318.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/rehbqiukfm9atoqbcmuelki9r0/23978718000.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f76597629d---gepupizelojisubiwowos.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e70805010---voxuvegokujamaserus.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc0afb55e3---vobofefimaliramexawa.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/d0mo0tv55p457r72d4vfh9koi8/ginabenamis.pdf
    • https://tenshinorchids.com/FCKeditor_upload/file/75459126293.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/403e275b28bd433a8cad8258f80ffab8/lizesuxasitixa.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609840457363b---28970385034.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c79554d78af---lopevik.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af108da0415---17250096948.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/a2df8ba3c1a3b42c8a689da76461db14/bowaribepewetew.pdf
    • http://dienlanhlongan.com/upload/files/74768958186.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a437095b15---28887802065.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5b013ed00---vozufeziforubiguzosazupud.pdf
    • http://3sdent.com/upload/files/52769331064.pdf
    • https://okna-stv.ru/userfiles/files/tobime.pdf
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/notuvowukugodosuma.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/8050da19f9dbd49e6e1b2af55e3db733/pojipomuxofofapexames.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/5edc60077c75df4460fcede449b1783d/nimetuluzuz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=leica+d+lux+4+instruction+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc38.bin
a38e82a127191fbcb5228fa602c481d3ff2bb340199919b885fd89f2354a6f61		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC38 20940 bytes
font_01_sfnt_off0001310c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1310C 16792 bytes
font_02_sfnt_off00014919.bin
604caf145b443f4866dc7aecccb37cc2a901ad555d04c929d474aa0cf79dbd19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14919 2704 bytes
font_03_sfnt_off0001543d.bin
9b6826ac5e542691b0efa82cd239b0cf4dad72ca2d30427529b38de8dbf8bddf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1543D 10768 bytes

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