Malicious PDF — malware analysis report

Static analysis result for SHA-256 2be1a92346e028e1…

MALICIOUS

PDF

87.1 KB Created: 2021-09-08 18:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 244832ab025e37918cc2526d9074d509 SHA-1: 3ec9977264b653196c495fc76b765af6bdd14c04 SHA-256: 2be1a92346e028e14707a11e7f9fb88637ab9fda5cd81cea86252f0e667d5904
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to phish or distribute malware. The presence of embedded JavaScript further supports malicious intent, likely for obfuscation or exploitation. ClamAV detection as Pdf.Phishing.Trojan confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tucarrorentacar.co/ckfinder/userfiles/files/nifoxaboziriwudezafu.pdf In PDF document text
    • http://globalfeedindustry.com/upload/files/30052328407.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210904_B836A657D3AE3CDA.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/vizujelak.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/pepoko.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/nofamizugo.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/05/file/47918712644.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/roxejajakil.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/nimofudurugifora.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/refijesajuzew.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1612f354f7a8f9---vawazitujakonajakuwovoma.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/hktqgm8h9uhhpq0s8sbu3i0j35/58987992275.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/pejazedunepurorefo.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/20994965054.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/mimolinuzi.pdfIn PDF document text
    • https://auto826.com/uploads/files/povawuli.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/32445870294.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/luxewoxemez.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/32998040352.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/13394571083.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd002e7406---naseneferimutolagorev.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612eceeb392fa---pokasufowaditomemebo.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/ba2b29275f4452cc142fa1c13c771027/kivatefesog.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/ziboti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=mindjet+mindmanager+2018+manualPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE15 11028 bytes
SHA-256: 3f2676b37a2ce518d2f9b504279c76c1f4132b8df4d0aac5b5d22f0c919b0e99
font_01_sfnt_off0001078a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078A 18164 bytes
SHA-256: 9c13e42161f622a12e57184762df0e2d67e5aa6df1644ba5f32a4642d4664df6
font_02_sfnt_off000136ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1