Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1b7f5a60612fc1…

MALICIOUS

PDF

100.9 KB Created: 2021-06-27 05:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 4002f1d094df0056b4faa06670bc259a SHA-1: fd8ba666f34ded2bf83d537955d1007eb4fdd60c SHA-256: 1c1b7f5a60612fc10302866c0bfa14c35383031dd72c7e75748fc0859d3f024b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the overall structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://irlanc.ru/uplcv?utm_term=enlisted+meaning+in+bengali PDF link annotation
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a4eead441---wubitenetawovogitutagogut.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/c28e29e7e7facc889293805a562c0127/tumapapitubero.pdfIn PDF document text
    • http://foodsafebox.com/ckfinder/userfiles/files/vuxazudakadev.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6c91f14fc---90399047245.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e506813c95---48159132033.pdfIn PDF document text
    • https://5uempat.com/contents//files/fifivitixelewagufapelogo.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609daeda20aec---fikulufoxenaxuwajo.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/vatowurojizo.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8e7c42291---60553069069.pdfIn PDF document text
    • http://www.toptehnik.si/images/xamibugefumazulubomezapa.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/56071265507.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/7882789169.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/gofuzimajusuruxube.pdfIn PDF document text
    • http://ligneus.hu/upload/file/17567819486.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/3061760062.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///32641733341.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/rexivisomuzafulimudufi.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090849a0e412---45149799527.pdfIn PDF document text
    • http://shosholoza.de/file/nupuboku.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/3qb74ihgv6dd51t40kae9nte03/doximusugolinemazu.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160711596eb00e---bukapakikisidur.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/2452837df92b92a5bbff2c7fe8f81ba3/sizujefukefogofut.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/8bc6eb8bb18f28a624fb1e5a041b5145/80947062591.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/vagodiniredewu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12542 18936 bytes
SHA-256: 68137762fd8612b351c16d56dea17a64816bc72118ef23f9bc719342c7d52945
font_02_sfnt_off00015641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15641 16832 bytes
SHA-256: 2b9b7ce221ee94551356690196a74a9990b13a805af304006228e63de10fcc76
font_03_sfnt_off00016e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E72 10496 bytes
SHA-256: 5083665ac6558f5a8cd8b378e462060edfdee7734e437b14ddfa7382bc4b1aac