Malicious PDF — malware analysis report

Static analysis result for SHA-256 4050e9b05da4fdd9…

MALICIOUS

PDF

86.0 KB Created: 2021-07-01 12:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 597c06b94b40428afe747581eeb26900 SHA-1: 2d20f665ef0c59dcca2c115ae94e0d6d229085e2 SHA-256: 4050e9b05da4fdd97282164ebfaa9b2c51e3fbf7f26742314321cd050b83277b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The presence of numerous unknown and potentially malicious URLs suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://shuimotongyuan.com/userfiles/file/38925069214.pdf In PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/17318225935.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/komomadeti.pdfIn PDF document text
    • https://irantruck.ir/data/file/medokakoguniji.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d8243ab0d---29373489819.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cb253ea480d---kaduwopinukosivexawew.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/xomaninijajujat.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/33010361184.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/a675147a5e1d62c4eeb1392529ac1787/nupavisubejusu.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/viwizafapijomazido.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/55ece022badf5d1faaef2da88b4f6d7f/93414412611.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2da054d78197f6fa70b6c483778f20f3/25263343758.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/4add6df85edff9413e4c337573e63a19/39326259255.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/dbo6fudbheaapri99h68d6543d/wowuzepasoseme.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8242e46ee---49461515274.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fc33b28ec---63126951123.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/vofoposaginafirez.pdfIn PDF document text
    • https://thepainter.asia/upload/files/levenikimunef.pdfIn PDF document text
    • https://iwistw.com/upload/files/30491058596.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/0aca59f0e19617d7b59a93531e33b37d/bofuduwirube.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608549bfcb097---ripagoseserupefowudo.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/dotoxavewoma.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f69a6875ee---46835209619.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55c22672a7---fagifireranu.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba9e1c282b---nufofawobobajuruvinivep.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a09304018f0---5852120266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=cbse+class+2+english+question+answerPDF 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_off0000e9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E6 11132 bytes
SHA-256: cced660795b0d1c923d3ba281382409e17741d516be11bf0220c5bdb5f283b75
font_01_sfnt_off000103b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC8 17228 bytes
SHA-256: 8b4430e3be856a0e712395efdcc0cc7a66f4499bc49ba128ce10f5dee830a529

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