Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fde9091dfdf76db…

MALICIOUS

PDF

82.7 KB Created: 2021-09-13 10:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ebdf8aeb9059a37eb42b36eb1537ba32 SHA-1: e5a1ebc2d2b1ba49fd9b2551c16809c594a1521e SHA-256: 0fde9091dfdf76db3ba6dfc9f0746c2bde5c510df5da23582322a719765bb834
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external files hosted on various domains, many of which are identified as link farms on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious content, likely a phishing or trojan delivery mechanism. The presence of a 'download' button lure further supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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 https://alyosserspneed.com/userfiles/files/rerudezemeluju.pdf In PDF document text
    • https://alzubidi.com/userfiles/files/61610898300.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109032337507486.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/pemira.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/44787886991.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d61c525871---84241728055.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/gujumepi.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613612c389393---givetod.pdfIn PDF document text
    • https://edex.co/userfiles/files/8834071938.pdfIn PDF document text
    • http://www.moyekolodin.com/files/45956216528.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210911062904.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/10279406320.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20219101957454174.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/momogegupediru.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/g3aonrh8b7q8i95nlnm36gv03q/xizajuxi.pdfIn PDF document text
    • https://netlandschool.cl/files/sugofadazigojabumu.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/44214578143.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/busoxajij.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/19cb667b956987c30187e175caedc799/makolikojitusexiwofomari.pdfIn PDF document text
    • http://akademibt.com/resimler/files/58702085463.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/611d0e72f7cdf77e34e8af2cb0278af3/jexojizevaponulurab.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/balufuwimu.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/49482801526.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=call+of+duty+black+ops+4+obb+file+download+for+androidPDF 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_off0000db9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9E 11256 bytes
SHA-256: 5e81ce79306610ff25c88f1f63cce6ef6416c46ec5f858547718dc79b4cdf6d0
font_01_sfnt_off0000f618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF618 17964 bytes
SHA-256: c42318e87578027ebebb473e51f92008128b25405fa275660b3c393b9c6a883c
font_02_sfnt_off000124bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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