Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f573a9550f8249…

MALICIOUS

PDF

83.9 KB Created: 2021-07-04 23:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b79210cc7be67ec37c062618a437c37 SHA-1: 4938944f361c44b64fb2281613ef934d8c7be5e1 SHA-256: b5f573a9550f8249fadad504dec7289f310300da71ea1eb4e1b8b424adc338ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The embedded URLs and link farm heuristics strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9830

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 https://allytemp.ru/uplcv?utm_term=meaning+of+dog+poop
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97467c1554.pdf
    • http://elementsgogreen.com/userfiles/file/malojubajijexe.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608796d925511---rafunepunisinimomatirudo.pdf
    • http://constantemails.com/userfiles/file/162413020643515926057.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160874b945f674---givujal.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/eaf43e7dbf27b4daa9f2ab2a03620be4/72591689571.pdf
    • https://alutat.com/data/file/vodolasawajer.pdf
    • http://soft-pro.hr/upload/datoteke/jisemuletavusogimat.pdf
    • http://partnerplus30.ru/images/fornews/files/vosex.pdf
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/96127663861.pdf
    • http://leinerpakgelatine.com/survey/userfiles/files/kiremanubusetifemakofiz.pdf
    • http://hzkontejnery.cz/ckfinder/userfiles/files/buzipo.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082e222600c5---10373005623.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/6f47eeff1cf5ea3b66d21f92dbe20f3b/zusagiw.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/2a910ecf840bf8eebb43d88cb570d29f/zuxifaduzoluki.pdf
    • http://nuraski.pl/wsg/userfiles/nuderugo.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f08d115237---lapilokofetutebegetuna.pdf
    • http://qiuyutv.com/userfiles/files/20210601054835.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/46cf3b8914221a1122e7a75579419781/10954256013.pdf
    • http://studiopol.it/userfiles/files/27369600587.pdf
    • https://mfdesign.hu/files/file/kujufixolafizukobuwogaj.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6b94d6dd5---tifedidefapipibuxujeboba.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8966e4460f---62426451281.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/qbs61kjsldl0rovajukjotplv7/joxokopi.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fa4aa7ee3---vigupomasuzegume.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbc1d6b76a---91014161919.pdf
    • 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_off0000e800.bin
448395a16d9ba2353f754dac5041256253150ff1c1dd772d504aa8aace381c22
pdf-font-stream PDF embedded font (sfnt) at offset 0xE800 10256 bytes
font_01_sfnt_off0000fee4.bin
ca6aa3a7f1178f874bd89b69fbe56097969d3204456e4a0283fc2e06725367b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE4 16660 bytes
font_02_sfnt_off00012a52.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A52 16792 bytes