Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2288fe78c1f7c5e…

MALICIOUS

PDF

83.6 KB Created: 2021-10-11 06:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b18ea4e8886c6e319133fb0033f9f575 SHA-1: 54e0f21701f42ab3daf7bdc51636a6c38c32e5e7 SHA-256: f2288fe78c1f7c5e0153169b4f0202596c58732563f1dd2949b8671d2032695c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, consistent with phishing or tech-support scams. ClamAV detection and ML classification strongly indicate malicious intent, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://laborke.ru/uplcv?utm_term=cheek+dna+extraction+lab PDF link annotation
    • http://steffis-strassladen.de/userfiles/file/wezifete.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/melativigemijod.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16133014775ff8---31774442484.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/wunutejaluxo.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614191fddaa91---56137532189.pdfIn PDF document text
    • https://blugarden.eu/file/pugali.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161339a511629c---41445777369.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1615e8037011c7---tutiwaravolixezarubugune.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/54088475064.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/69043559209.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/39673193796.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/31228f2c663d07ce68b179d38f3d96fb/5377726168.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/14334731679.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1615a954596bf2---bubobewisoxalex.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16161682297d3b---62524140031.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/9469462344.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210914_142041.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210917_514F10AF86D3AD23.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/80922084546.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/gudefit.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/neberugananopuxigel.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/24436484319.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/28860256188.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_off0000dcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D3 19968 bytes
SHA-256: 30e3b3b78797f50663982ad3b80a5335c26c22b36d5a1e33f4a99a91ed939665
font_02_sfnt_off00012887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12887 10664 bytes
SHA-256: dc1e2c9c6eec2a65dd748ec33025a6166d16ff7b13c51a24cfa823f8374533a5

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