Malicious PDF — malware analysis report

Static analysis result for SHA-256 57cd5e424f7a3e70…

MALICIOUS

PDF

84.3 KB Created: 2021-06-28 13:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf9f13c6ab7293497462342ee3a756e5 SHA-1: 5695d8e88e0c41ada65a94c2ad9f04651f6c4390 SHA-256: 57cd5e424f7a3e704d5f7089ea4f5c7ff87906c8e344863d845019686abe3a50
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO poisoning. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://budoprojekt.eu/obrazy/file/38050436489.pdf
    • http://cdmvt.cz/sites/default/files/lerovedanolezodedos.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/wolomekofarosa.pdf
    • https://menu2uplus.com/images/file/jivaroxufesoxaxo.pdf
    • https://ideylia.fr/uploads/file/56320953742.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081be4e4d2d2---dakipanumuba.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/6949580911805f699b773029cf537b75/wikeludawidewesen.pdf
    • http://classiccar-jp.com/js/upload/files/wajonuzimigedakumi.pdf
    • http://zulassung4you.de/bilder/file/gulutenijejixuguvele.pdf
    • http://iglozawiercie.pl/zdjecia/file/logupedodofegedatofofupij.pdf
    • http://bajcsidavidfoto.com/_user/file/fujitajawelulowej.pdf
    • http://tuzvedo.hu/elemek/file/niraxafikewubadebaxun.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/522a20cd4bea03531c01290e0ea8c9c0/sinusidalajupiv.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4cf31d91c---tofejelarodomugi.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/3ddte62iq86o6n2tgfihi98r8b/dasinaxesetina.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/ddba454fe546adf952aac2ffe970582a/54900345584.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b96f2ae8b23810c2962bfd3e216be6d0/60089421506.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/cf04c3b82c589d7d70d1af250a905755/pamebeto.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/1feeb0117ed47ab751340d0aecb7a305/putomununosowepa.pdf
    • https://a2designbg.com/userfiles/file/88339922882.pdf
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210628141513.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/ed78f796c09a7bdfe3ccf79f16de4906/xajaguxatemavid.pdf
    • http://kawoka.com/userfiles/file/kuzogefotomuwedinelexolo.pdf
    • https://accuratesearch.com/userfiles/file/788064356.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607235cc1d7e2---nopizet.pdf
    • https://mn-lawfirm.com/box/userfiles/file/2685019450.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/0fd878bc518dc2ac612384210a7b9b0f/xenukuronobononoxefogapo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=circumvallate+placenta+ultrasound+images
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e401.bin
535e37e4a7dc2248c6b0d944536976711f1601a1fbaec6a6e50d751c71082dd2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE401 11052 bytes
font_01_sfnt_off0000fd8f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8F 16792 bytes
font_02_sfnt_off000115a1.bin
99f138937e9b2bec0b6d6d2c95b2f825d12f7c8dcab94310d116e4817140a446
pdf-font-stream PDF embedded font (sfnt) at offset 0x115A1 17096 bytes