Malicious PDF — malware analysis report

Static analysis result for SHA-256 7495cd95097ed573…

MALICIOUS

PDF

68.8 KB Created: 2021-09-26 10:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 18bff343faaa0f5303effaed319682dc SHA-1: ba07d14abe0af72a9da5409610005e5b75df9203 SHA-256: 7495cd95097ed573059a5b0025da4259330b2e7f3314c29846be220ca26f0745
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to lure victims. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=samsung+android+ringtone+folder PDF link annotation
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c450ae11d---25793979406.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/vodevosobewiru.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/88023197537.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/93093362153.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/lupanabejovuketabigizewa.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/jezowezidezo.pdfIn PDF document text
    • http://makaroma.fr/upload/file/mujaxapelexe.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210914_79D7DB4E174C8580.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210924032902.pdfIn PDF document text
    • https://lerivagedesmilleetangs.com/caningest/images/file/65546469507.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/13896297077.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/idja0fkamq60jepiimvsj613i4/dejikupujeju.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/efdceac59eb752fe10ab6a5ace7aefb6/miwezenulibogalinepovaba.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/xalerinufegi.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/jamudipon.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/8gvtd3163cgd0s3rtjqd25ne02/36581505154.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/60467036672.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/mubedusowagi.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/81506315306.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/welakumaj.pdfIn PDF document text
    • http://www.polni.si/Images/files/74770101691.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/20005514095.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145254ad4ff0---47837500981.pdfIn PDF document text
    • https://bor-diing.com/upload/files/25598531563.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/vimojilulediz.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_off0000b07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB07A 10872 bytes
SHA-256: 97000b0deb60757ca2c123b774a85e1a5c9fe6f84d5cf04b114dc82ffb35f341
font_01_sfnt_off0000c959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC959 14488 bytes
SHA-256: 919827347c433c9add93c113a5c034fff42982d8662814817750b31b2aad6207
font_02_sfnt_off0000edb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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