Malicious PDF — malware analysis report

Static analysis result for SHA-256 bafb7f12966ff6d6…

MALICIOUS

PDF

73.5 KB Created: 2021-09-14 23:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2136b7cefcc7b0e35fc6e1c313acd138 SHA-1: 98b68dca78eb52d8a9178c38fe536ad0b2db1e26 SHA-256: bafb7f12966ff6d67775be9b14f5229f32fcb665922cd3e6c9c2d07ff2388cc3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a significant number of external links, many of which point to compromised CMS upload directories or disposable hosting. This indicates a likely phishing or malware distribution attempt, where the embedded JavaScript and links are intended to redirect the user to malicious sites. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=talkin+dirty+after+dark+full+movie+online PDF link annotation
    • http://hilimall.ae/uploads/files/51198127432.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/14255692761.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/83401422340.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d9c7763477009a191a3d9b4f6034558b/67474518683.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/defusaxadir.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161392c1405f9b---pexazur.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/34089620047.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341aa786cec---95236666237.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/87275333026.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/mutirabosikeremezul.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gotulikifinowiripiti.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/54522256719.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/wavopabajexunusuzalinof.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/65103877913.pdfIn PDF document text
    • https://alpinashop.bg/files/46544029275.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/wenigo.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/takefosinijilosegosuxu.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/61155295145.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95744326677.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405300743a2---68137526438.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16136ca848dbb1---55897321381.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/mekokisew.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/rirumujaligozat.pdfIn PDF document text
    • 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_off0000bb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5F 10684 bytes
SHA-256: ef3ebf9cd04c35427fe989c454ed96936be15e6559dc93e6e2496e43064e9224
font_01_sfnt_off0000d3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DE 16908 bytes
SHA-256: dc863ba1d943296bb3f6d041482c35e8e190a0c2b028b2769113eca68f0320f1
font_02_sfnt_off0000ff8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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