Malicious PDF — malware analysis report

Static analysis result for SHA-256 092f09a828e9a0f2…

MALICIOUS

PDF

67.9 KB Created: 2021-09-27 07:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e6e317b40e972c8a5654bada47a67839 SHA-1: fa17f4be758c6fee0ab6e97260a7e333a306101d SHA-256: 092f09a828e9a0f2e61bd366c3fde16498dcc0f528b62c8fc8bbf3ca8ba0a74e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the heuristic firings point to a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://hoachattn.com/image/files/95398620074.pdf In PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/84215175514.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/dofirelijo.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/pakotimomudovigup.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/71497341521.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/a0bd7c074194584ba3372b900c8a319a/gorexemag.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/62b598e14c37b02314c6f96a380e5783/miriruwev.pdfIn PDF document text
    • http://techmechengineers.com/uploads/71047399191.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/wekapanikizaj.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/72944272320.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210919185503.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/33779086051.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/e72211b6e8cc147676707a9a3f988255/12770716963.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/mamiwotepali.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/39400398937.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/31851032088.pdfIn PDF document text
    • http://esipro.be/userfiles/file/10727116469.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/pabenuguzedovaruji.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/wilixijilovorelutaxez.pdfIn PDF document text
    • https://intersat.lv/files/file/jefomegu.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613723fc3ad3a---pabitokot.pdfIn PDF document text
    • http://veitali.com/upload/files/mesepajeturi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=es+file+explorer+smb+2.0PDF 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_off0000aca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACA6 14936 bytes
SHA-256: 2f3ff4341d81881e6e189c2bb2a48a91059922975af8212126622bc082398509
font_01_sfnt_off0000d21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA35 10688 bytes
SHA-256: 7f46933969f752bc772f30ebeed499f589ac14c922b150c35def9b2a0550213f

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