Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21451da3093e754…

MALICIOUS

PDF

86.1 KB Created: 2021-07-09 14:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fe65061949970bda2ed97cb3f6792da8 SHA-1: 19cba17cf36f860f3fdaa8ceaf70abfe414355d2 SHA-256: c21451da3093e754625eee57e91ca6c08089dadd1f2397e27a88e82b9750d595
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress sites, suggesting an attempt to host malicious files or redirect users to phishing pages. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or downloader variant.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/f23837a470de0e66b0b455529b4bb3dd/70591940816.pdf In PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790de7af64b---suzinijopoda.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/78598590079.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c8059ce1e---7402220638.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210507071018562055j8tylr.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/famozuwiwofoposutevizora.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/fepigikawijenuw.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cab022e7e---fajudemovakek.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/d9fc3e3db349787453bb6cab75ce4ca1/7237709126.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/tejakuxogevadofivafa.pdfIn PDF document text
    • https://alutat.com/data/file/xewutafixarobon.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/2dfb2425472f8d3e6f2f6cf5f37a5f9f/10625678921.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b53253da229---bamovanafodujumobuxore.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ikihu9ehdh5saelc10v7ra1auf/30559009100.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/rabagasasibevegar.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/77282133194.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/werenofemavaw.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/rubetur.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac376a60d5d---ninulatikesutonatonepune.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e698bc07f86---pexowonubidogis.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b556309f3---29228780681.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/muzijosujut.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/resemubizukuzokugowus.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/84305138060.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/fidesaxigikabif.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/kebumezod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=afterlife+series+2PDF 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_off0000efa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA8 17360 bytes
SHA-256: 8583cffc20725521c4cbdc5ccc22d1e5b3670e416fced4679bde83ad4265bd1f
font_01_sfnt_off00011d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4A 9920 bytes
SHA-256: 561073336c9cf65f130bdeef65af88fd8d22c4b633f850e8a5a2071b6287b403
font_02_sfnt_off00013364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13364 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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