Malicious PDF — malware analysis report

Static analysis result for SHA-256 3debe9d3a409abc3…

MALICIOUS

PDF

82.1 KB Created: 2021-09-15 14:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f0502ed686ce366cb4afcc09b7cff1b1 SHA-1: b38cda26dff7176481a0e4abfd134fc778e975b7 SHA-256: 3debe9d3a409abc388fb57d92d5e9089adaec39d982613234717061e962191f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to host and distribute these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=mcpe+minecraft+pe PDF link annotation
    • http://arcstema.com/userfiles/files/bukagimufuxogobukemaza.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/bowuvaxuvulez.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/2tvshiroii09sdopvp5vktuvh6/ribovijijetilatofuzomuwak.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/39999707902.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/926953304.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/8471c01957f50c841b87611e6dc3f38d/99435892919.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/78c02eaba7f2f56cb96a624d41976be5/pepemipisoduwipubopegabi.pdfIn PDF document text
    • http://stylekd.ru/files/95092858651.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210906054244.pdfIn PDF document text
    • http://brain-sh.tw/upload/file/18694009204.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/wedilatogofimuneruf.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/lugafezanijak.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/xivavetirofopimubuj.pdfIn PDF document text
    • http://acelybio.com/upload/files/viduborafojedogiwazafab.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/75423251545.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/71041931026.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/82537966072.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161411907989e1---78256224189.pdfIn PDF document text
    • http://myesen.life/userfiles/file/91578455333.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/44674020475.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/kudazakagumaw.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/sexalumajuse.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/59723485868.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_off0000df47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF47 10300 bytes
SHA-256: 878b2ef421e6a219a123d618f787968ff41b133003178daa9b626c9da194b46c
font_01_sfnt_off0000f66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66E 17200 bytes
SHA-256: 4bf3ff537491b58423ee2da06f824c695f34d2dda1fa4f64b26a6d794d36a2df
font_02_sfnt_off000122db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1