Malicious PDF — malware analysis report

Static analysis result for SHA-256 bee97d8de795cb72…

MALICIOUS

PDF

73.8 KB Created: 2021-09-07 01:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ae454963710d6779c7356e5ac30dd200 SHA-1: cd9881494931c14986145a460cb49b2046b9c99e SHA-256: bee97d8de795cb72113dc438d2c54f3cac78f403c4cedff601428628ea2bb825
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating attempts to obscure the true destination or leverage SEO tactics for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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 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://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/4m7q95ocs9b0584tadphcilv8n/40765393416.pdf In PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/bmonso8fgc8ba2ni394eu7to56/gaxagomes.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/1so39t2btrtspahoc9v5sfttqn/sedesomagopunobifibiw.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/mabasepujaxe.pdfIn PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/56824542714.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/kizinigipaziz.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/sixinatamamigitabez.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089ba6dae84a---juregalin.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/1ff12eb896ceb339357bfa7fca7552f9/fuzumudo.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81097535948.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/71372714768.pdfIn PDF document text
    • https://wipaphun.com/UserFiles/File/lanofezavetumelo.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/41686332511.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/reduzenosexeze.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/kufipari.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba3de8faf1---90834768894.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/50792858093.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/52364733494.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c66382217e4---kafavuzowuw.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16113d84b75103---nevixozopowux.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/lawikoligimilukonusamofo.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094da72ac4dd---29214435771.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/74m9ckhss09fepvbe1iqpdd2v8/78416706328.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/e7a1f8e1963085f1997dd239795b1a35/89316559102.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/52503375695.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c6bbe9d9b---tipafiwokut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=intro+to+bayesian+statistics+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_off0000bc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC0F 17096 bytes
SHA-256: 7adbbb038a02c970681d85c86790ef9d8d0c7077c1a4c5704e44d5cd2e3c2a9a
font_01_sfnt_off0000e84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84D 10772 bytes
SHA-256: 313efc2725f3afa61e42ef7d28ea9ed6c7938bf4953a997ea7f9a143d57a3215
font_02_sfnt_off00010115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10115 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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