Malicious PDF — malware analysis report

Static analysis result for SHA-256 817f2c61b6b4a241…

MALICIOUS

PDF

72.2 KB Created: 2021-09-26 11:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 567edf18040823b333fde497b3ea398a SHA-1: 64af558173c44c0f26967afbb26f9e69defa78aa SHA-256: 817f2c61b6b4a241c5078ee86a358c81671e440a78f1990818578ad510b47ff3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload. No scripts were extracted, but the PDF structure and URL patterns are consistent with known malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • 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 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 https://ketchas.ru/uplcv?utm_term=ndk+r21b+download PDF link annotation
    • https://vibanghanoi.com/uploads/files/24578368918.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/29233215924.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/sewalububajexesatiwaputos.pdfIn PDF document text
    • http://biomehl.com/images/content/files/21253682661.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/garopij.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8516264c5---sifutirakap.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/lurexejegujisugusawenuzob.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/jowonaloxanabixifeje.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/6a4cd70613201f05ff911edb3f57df13/ridowopakuwuguwaluzin.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/163543b8996099e2c354f592e75e9b14/kifonalaro.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/22351808938.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210914_C2C5552EBB5DF8B0.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/pizagexakinipovubosanutud.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/rerolegejukibegufunigeful.pdfIn PDF document text
    • http://adice-area.com/pictures/files/87284298281.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/61679854938.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/zotodo.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/risifijuwasomavetedixa.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/vowaxaran.pdfIn PDF document text
    • https://parkettworld.com/upload/files/38220176204.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/36975740456.pdfIn PDF document text
    • http://tabletopad.com/images/file/wumugutubilomodar.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/wifix.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210926045545.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140821c60823---85276579278.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/suzebi.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_off0000b48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB48C 18140 bytes
SHA-256: f8665f802aa91da4df08823d32eec9bbc1cf14e54ad4d271481ed621d88f2265
font_01_sfnt_off0000e2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C9 10220 bytes
SHA-256: f4f0678449c87c4b9e0ee196302992333d792724e069f2f18b1a1709d4d3e46b
font_02_sfnt_off0000f9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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