Malicious PDF — malware analysis report

Static analysis result for SHA-256 0533cc438ab9d21c…

MALICIOUS

PDF

133.8 KB Created: 2021-08-10 15:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b1e2dd18e4888e713f8760a1a8101ad5 SHA-1: 5455d9f66412462787bcc5ae7df6025afab197e9 SHA-256: 0533cc438ab9d21c72df23db143f4234b0f8726f311eeb61fe4828c121d83ccc
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to initiate malicious actions. The presence of heuristics indicating a 'Password-protected archive handoff' and 'link farm' pointing to compromised WordPress uploads suggests a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the download of a second-stage payload, possibly disguised as a password-protected archive to evade security checks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2d8ce14ff---58033380338.pdf In PDF document text
    • https://bnbcostaverde.it/userfiles/file/10872650561.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/46799348119.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b35e9bed978---woruro.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/khrpfp0vneigr19t0tr1ujs396/62654750773.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d838b41596---norudagile.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13e7289365---wurunage.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f505d07e6---xosodudojapigir.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a789d44ca---91646718913.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/kogemexupawewisi.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/c0cd75877b6e9aa87ddd129564e5ac52/11461464920.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/60i5isccga2pvng0drsp9iq52m/sejebelojufum.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02af620cf8---nukokekotavu.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8a4b10044---96178808010.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/20401132493.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/momipofepulurobonazo.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/t6hj0nss4oooic3uhc7tdn68d2/63258360854.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/9655945227.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/mubelafugif.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc541773ad8---foxiwomabozexosikime.pdfIn PDF document text
    • http://djapm.com/userfiles/file/xuwatirofibepag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=desire+system+torrentPDF 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_off0001a87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A87C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C093 10176 bytes
SHA-256: 48a07c9a312d759b8f2ebb23c0e91d7ea0a0e8ef71ea0eb7ce14de1cfa2c000c
font_02_sfnt_off0001d760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D760 19844 bytes
SHA-256: 9b198c205df4a02f4b27bb23926723a998bf169703ed45d4f370ec46c296625b

Open this report in the interactive analyzer, or submit your own file for analysis.