Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bbc00aeade915e1…

MALICIOUS

PDF

82.5 KB Created: 2021-10-04 11:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 73ff32457aded375c42590c5048328ed SHA-1: 9fdba612dbb4366a10b17120c64457b8694811dc SHA-256: 4bbc00aeade915e1403a645983cb4a155238c149d9aec79ad8091af1c27cdba0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Numerous heuristics indicate the PDF is a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to external malicious sites, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=meaning+of+disciple+in+the+bible PDF link annotation
    • http://s2group.pl/userfiles/file/71147949867.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/natela.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614f539bca43f---fawabavidaxato.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/modiwetepowore.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/904cddc750fd50bb5b0008ede49884ce/36125907913.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/xefeba.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/rawijusawiwanudo.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/784b56df0804d63e4faa85317fee869d/baxabewadikeniz.pdfIn PDF document text
    • http://jpiano.net/userData/ebizro_board/file/wobene.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/rizunipesazigugaxawi.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/21472919933.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/8038103554.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/zozudom.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/fekefopobifadomivokoxali.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/zojomitotonenunew.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/75723845182.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/zexijad.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/89418514548.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/fisamidesajizuxujis.pdfIn PDF document text
    • http://ipublicity.cz/data/file/52173290744.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/jorig.pdfIn PDF document text
    • http://montesantangelo.it/files/files/71372884703.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/72301985474.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/ditikakiloxikin.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/vafenuwabogav.pdfIn PDF document text
    • 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_off0000db9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9B 10932 bytes
SHA-256: ca00fec135a8025ff329e796674259f4d2daaa8f81d990f921d4c6642c1ff366
font_01_sfnt_off0000f46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46A 18632 bytes
SHA-256: 56936b823003e141d922a558bc529839f701fc7eaa12eb92c6f0201438c88ace
font_02_sfnt_off00012428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12428 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1