Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd25b77419bde48…

MALICIOUS

PDF

92.7 KB Created: 2021-09-02 23:37:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 203dd7a55da6568c6fe2c7cf9cf61baf SHA-1: fd568fe1f5221b42b2dcc1e244137240b15c65e2 SHA-256: 8fd25b77419bde48df8aa621754ec69078ec27f360831dadf9b53146b5c8433c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. The file functions as a link farm, containing numerous URLs that point to other PDFs hosted on compromised websites. These linked PDFs likely serve as lures for phishing or to deliver further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://garglob.ru/uplcv?utm_term=pediatric+bronchiectasis+pdf PDF link annotation
    • http://ehomeforeclosure.org/images/file/pulakow.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/97188808349.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160706d30d532d---42662917690.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/530581a515459fe51e62b77c5a831456/vudobigoli.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160be9bb868ac8---48433016367.pdfIn PDF document text
    • http://innotack.com/userfiles/file/ledalokufomajegelo.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2ecde3868---95694086045.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fc3dca02cc9---gujiniwevomuxawurur.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608291cc49560---53081451770.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b793b1f1ef1---zijazi.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/vagoneviku.pdfIn PDF document text
    • http://mahlkoenig.nl/app/webroot/files/userfiles/files/95196307027.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210815192422.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/60681023823.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/2ec202e1a925c28ec32a38456845790f/69522602258.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609a373f90aa7---9201340390.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/29675594960.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b430da8d720---gedoletodu.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/tezolojowuwitotiganuv.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/fujafokoguvepowe.pdfIn PDF document text
    • http://fdceta02.fr/catalogue_dynamique/file/17323978700.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/tavipoxukovowodunuruwiri.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/rhvt0tpu34u09tm1tghjd0me52/28014802020.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/50ef19926a848cbef42ff13685db3f4e/10583696970.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_off00010422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10422 10812 bytes
SHA-256: 002b94254e470aca7b6db5a8221f0e66030900ba38e152dbf40d21b905e5bb95
font_01_sfnt_off00011cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC3 18420 bytes
SHA-256: 8aeb3818ef816053ff930258fb15901b0f74529b4ad7bacbda0ac16b113c5a28
font_02_sfnt_off00014cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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