Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ddd50572d37cab9…

MALICIOUS

PDF

86.1 KB Created: 2021-09-12 08:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c9d726af32bccbf19e864aba414b746a SHA-1: 1ed3a0345b12cdbed68160c1ffe1c3856de110e7 SHA-256: 2ddd50572d37cab9ea7e6c8abeb967e4a743f6755f7c870066346ab5561c6bfa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external PDF files hosted on compromised CMS upload directories, indicating a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or downloader campaign.

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://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/f9d8035cba40791eebc90e3e1f310d6c/midoj.pdf In PDF document text
    • http://hanahana.vn/media/ftp/file/tofimesatakukosufezelij.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/merofovukutazod.pdfIn PDF document text
    • https://grnca.org/img/files/files/lokutupoguvilisen.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/xurivuxago.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/52947686464.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/jerawapovixo.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/82433070120.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/fadesajekiluvadegit.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/93079028853.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7a91eafcb---21405906808.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/2e69f0e02f0f8b3aaf0cca40d415a158/9844021006.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/r1k2s4itehh8fhdb85vdcg1gud/fuzazarimajajitarozen.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/47216587074.pdfIn PDF document text
    • http://www.og2c.com/images/file/98969810158.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/gabiverimoribuwilijuvix.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/nelazodupefirigugo.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/isg403sc931a9rkahfm079qsf4/bepenatoboxuwusu.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/zanojufazata.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/22589844414.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/bupikanebavepur.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/39972749174.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/96069674386.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/gedezomigogivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=best+photo+editor+for+pc+free+download+2016PDF 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_off0000ead0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD0 11320 bytes
SHA-256: db2b1e35f552abd9aebcc96a352f0c5a3451abc5c665db23c8e67563021ccf24
font_01_sfnt_off0001058b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058B 17340 bytes
SHA-256: dd032f6291345a3962c06261544993590afde1c2153b8592f744c71bae8ab782
font_02_sfnt_off0001326d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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