Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f1e10cb5fe4833…

MALICIOUS

PDF

74.9 KB Created: 2021-06-28 15:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fcecab5faa10d9cee9c6e13ea012bbb1 SHA-1: 7ade54c9ba4dbe5b73ab0a0bb5a7dfd77b37f4cb SHA-256: 20f1e10cb5fe48333c0381e3bfb03ee4b9cd2bc5271e352d93952ec397564d63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this PDF is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://laborke.ru/uplcv?utm_term=how+to+search+by+pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/il2v6k0b2nej8jk63p63aee444/76212381366.pdf
    • http://moyamoya.center/images/hand_uploaded/files/ziremapupopu.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/3f4396ff17271f32f0c62bf17511f922/nanef.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/e82d1f77bdd6fc5f11666fe7d6e90e14/67522147685.pdf
    • http://amphorabeautyclub.com/campannas/file/42316954483.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c2a4ef65f---kijudamuxexevejade.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f463210e73---97016348103.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/ddsau23lqepum3jg4qav0neh37/22063479311.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/b8915f3e456f4bcdba74f8a0ac8c2f4b/derikebigaxovixaf.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097abddf0585---30212734301.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/3e53ec011f4b062f30807d5afe1129a4/lomomo.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/ca80bc32cb6923222899c2f686e710b5/1534207564.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b96e6e65d64---mugojizuxoxalusefonelutam.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076085735e41---52040844934.pdf
    • http://knshzj.com/CKEdit/upload/files/jadedisipomisudox.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e1eee82f42472da5b4245431e7ce4063/zobexasefad.pdf
    • http://nextgt.eu/uploads/file/rivivumunitamikaredusobo.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742868b804d---baguxabawefozekixori.pdf
    • https://stiff.pl/ckfinder/userfiles/files/36573384160.pdf
    • https://thaiahpa.com/flash/files/50389166966.pdf
    • https://pima-alarms.net/slicice/file/luzofob.pdf
    • http://allycatering.com/userfiles/89283693534.pdf
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/33489075512.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_off0000c1e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E3 16792 bytes
font_01_sfnt_off0000d9fa.bin
342108ee5b5a88e12eda127f25332f29f673c90a3b6431da3744c3a18e7d2233
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FA 10804 bytes
font_02_sfnt_off0000f2da.bin
bb7280f454c1cf2b9a3219fd08337d6cb41804a07bcbba15fc18f668f63eded2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DA 16736 bytes