Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade8f70bc23d9792…

MALICIOUS

PDF

86.2 KB Created: 2021-07-01 12:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ce93587d7d970b52a060fd9ad8b1c8b5 SHA-1: 23eb6292df11dd1ace1fce3fe580c2ebe8c1adcc SHA-256: ade8f70bc23d9792c7fcfa232049e5374f37dc52ab4b9a3a86f98a35d5f8eafb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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 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://allytemp.ru/uplcv?utm_term=500+word+feature+article PDF link annotation
    • http://myucpb.net/userfiles/file/tubixejazalaravelipovupa.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/63625a78a27e11cf415b745c070814ff/64986620999.pdfIn PDF document text
    • http://abwessex.com/uploads/files/sekopigifesafojum.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/77424333480.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160855a3237a3d---fapisodanatagajaletegoka.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/gifunesateligirovifef.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/3gsteekmrrlspqda7cf7g3nj5g/manul.pdfIn PDF document text
    • http://stylekd.ru/files/lezudosenivar.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/58873348481.pdfIn PDF document text
    • http://servmed.net/userfiles/file/76663767843.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/c50cf3542823c8cd21acaa6944a0a8a4/37762774195.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57318aa1df---39836058774.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c0af55b97---69411951684.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/varadiposaxewa.pdfIn PDF document text
    • https://anakaygame.com/calisma2/files/uploads/tileginorokan.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/venasivelib.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/7gvlov82n26h12c6nvtjgj4m28/47312261754.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/ebffb0de0c61be88eb143d9c8e518309/61781136520.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf797ebaedb---nexuzirezogumefibi.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d61af496559---midijofeboxubilabuso.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2a7771a3a---zilulabow.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/86043263879.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/1858497135.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/sarevogemolewusifanovekej.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_off0000eec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC0 10544 bytes
SHA-256: 3837b08f9113418f4702e6a82e0d6dca37592fcf23bc86dc10db47bca3fc5570
font_01_sfnt_off000106f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F4 17224 bytes
SHA-256: 0940e634ccec5504c96b4a848c629f6b91785ec87b2489ac5edbd4fc53ce7ddb
font_02_sfnt_off000133a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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