Malicious PDF — malware analysis report

Static analysis result for SHA-256 a762d9de2091f6ba…

MALICIOUS

PDF

76.2 KB Created: 2021-09-03 01:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 188af17bb7fca8ec6afc5f6fcc438c38 SHA-1: 9a39a8ac3074f318c5a76b48b3c59130c83a5ca1 SHA-256: a762d9de2091f6ba8da62264c37a999d20d0f010f0ad993b0693229bbed7c7be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and embedded URLs suggest it acts as a lure to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/9bab6efe65d38971522b3f0d23e51578/fagaxurixe.pdf In PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/u4q6acuojgpljbuqdeh2c1d90s/50064348749.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/340ee1aa2685870fe006e029f987b577/litud.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/8484827dd0f9444492aa563a04bf55b6/zezefidunofusosanaf.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/romawavima.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607be144b4af4---tuviwawipawemanezaw.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/tuzob.pdfIn PDF document text
    • http://lowchens.org/userfiles/file/64315246397.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050121001773499.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/b001be8d442030e65e379244409616af/robilifakonijojuda.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/gabezixigiwewuxubipu.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/85397840529.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/0e090cf5c40529c161b99ffc951c216f/80469110986.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/rapif.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/17cdb42cd9aff8ae86849128d5846fcd/vejaxiwixezexolifim.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/jekutatatudizaze.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/p1ha2f4l73la1pg9msvunjvuv6/15556933167.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/87fos260fkae5fs2hn23o309p6/86541501464.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/2cee247d761197a0852e64502a8a1f38/jiwulobodolo.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/98812849151.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/37d53b7b2fe31b2943b672532ca04f81/luwexubaxavuvola.pdfIn PDF document text
    • https://globportal.com/upload/userfiles/files/mewezadomupotalogegirib.pdfIn PDF document text
    • https://premium-house.uz/images/file/92185279340.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/wefumema.pdfIn PDF document text
    • http://retrofotr.cz/files/file/ponosewomizep.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/vakoxugekawiwejiwono.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccfa180a26---kiteputidukipowaniperuzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=o+patinho+feio+ruth+rocha+pdfPDF link annotation
    • 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_off0000c53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC53D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD54 10628 bytes
SHA-256: 97dbd83bef0fa3504fa299a7cb35bfff0adb82c2e1a89e327229205d82be934a
font_02_sfnt_off0000f590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF590 17408 bytes
SHA-256: 9061f84ed608021b0689a0f0cb68f37667994588e5c7118a6694c0f0072c3e39