Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d1ae000c2a9ec5…

MALICIOUS

PDF

79.6 KB Created: 2021-09-17 03:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b3817a1d659d417b6bd80038b581a6cf SHA-1: cf6ff87524cbc03da64f9346fab73538210e5b60 SHA-256: 42d1ae000c2a9ec5f9d3abbadddef0481cc7e340cd371f2670d3d0795ac41862
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to redirect users to potentially malicious content. The presence of 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicates a pattern of using disposable or compromised hosting for these links. The document body is heavily obfuscated, but the overall structure and URL findings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nomylo.ru/uplcv?utm_term=death+of+a+salesman+questions+and+answers+pdf PDF link annotation
    • https://biomisszio.hu/tmp/lejoraf.pdfIn PDF document text
    • http://zmz72.ru/files/file/27794571010.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/sifasegakutafivaxubuxenib.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/gopowilikuxamiruwu.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/rezijivazonirabarupivim.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/64942653581.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161403a7ac94ab---31699169980.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/97563508865.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/1788714282.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/18637613287db019d734788cc8ee2664/62920351497.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210917_C7B7A3123F19EF2F.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///jonajujadugu.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/79037301641.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/vipexulinuwisawapamezuko.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/guwofatedegakodetibug.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/sifonobexuwelezunizuwupi.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/94612853315.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/1382efd1bdba646181aba86b096d9d4a/mexugapabukifobirafoged.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/xopufutitobegu.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/tutaligowo.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/lotitejo.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/barifodazojuw.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/4210b2c8e7043fa9e1c063b050c8104e/kivojabutepuxe.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/nawitumipes.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/dilufiketubuvumi.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_off0000d16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16F 11096 bytes
SHA-256: 2705bb92137b3d51611bd5a1097c7326f2205588695da1a7410212db8ced4405
font_01_sfnt_off0000eaeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEB 17428 bytes
SHA-256: 416d3b3fde7304e26e8aafc465065ba19a0b1b0419df7e84ed90ef1b8e1e1600
font_02_sfnt_off0001182c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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