Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8e5b20486b0e8c2…

MALICIOUS

PDF

74.6 KB Created: 2021-09-05 13:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4ef490353013ff4a2fb5a2fbe671e111 SHA-1: a5681859e7ea6ca017703eadf79c39f8e15d3a55 SHA-256: e8e5b20486b0e8c2b7ef1babb777ee28202aee8166e9a388792d0dfd4abb15bf
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure itself appears to be a lure, directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://t2sc.me/userfiles/64541643848.pdf In PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/493a27509a37e255554bafd310dd89b2/sewitisibolozixez.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/53258037562.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/gizosejexefivukadex.pdfIn PDF document text
    • http://dzbnf.com/upload/file///dazude.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/xezexilijax.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8d37530b2---nibegadolowopesevub.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4d6983ffb---rikesonunateg.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/61969020225.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/44866086220.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/dmotql2h2fa4lo74r1auq2o2qt/5318978355.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/pojovojesivixa.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/gubovopeleker.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/sb6rhho7tu9kf24dj7v9sbtskf/xukuwaki.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/zonumigawatenavumodokokil.pdfIn PDF document text
    • https://atiksigorta.com/files/jutonababitipuvowos.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/57068488429.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/32264405621.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a44e4938d30---razawaxidonuraw.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16090502d5b504---36306533378.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/09e65f28fcf6c3a4524097fecdb4a25d/vivevamijurapogutizalaxo.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/munup.pdfIn PDF document text
    • https://cape-electronics.com/media/file/jivetutifulalix.pdfIn PDF document text
    • http://podarox.ru/public/files/vebofiwovepilewifataxazeg.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/957387d0f656975317f8fed02f35b5e4/fekituronupiforu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b034dc42174---88191605270.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=manual+de+pneumologia+pdfPDF 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_off0000bc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD496 10568 bytes
SHA-256: ecc8a90316eb382927c2489f8c166a830d3bc09488614b32a8e8d49101cb5f62
font_02_sfnt_off0000ec51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC51 18180 bytes
SHA-256: aa8f9590ac19162006dff11e889fc4e6e70dfbf55a55ba5a8d365a86d137ad65

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