Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c2858a93f34770…

MALICIOUS

PDF

85.4 KB Created: 2021-07-29 22:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 1a3a1d1ccfc1f545bc83940367b55d68 SHA-1: 1d217fd777906111241a0849c27ae0b5958dff32 SHA-256: 55c2858a93f34770f4442d1b0d3bb031f61c15110c263e235aa9b97f1be1e5c7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and URL patterns are consistent with a malicious PDF used to lure victims to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://eau-msu.ru/ckfinder/userfiles/files/sukowetezomu.pdf In PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/tu12noniinlbrkfbagd4d7un5a7h7vmt/30101153527.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/linerofebitaro.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/6bd1836e17b1e84b661a774ebe31612c/59758344926.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/58281223597.pdfIn PDF document text
    • https://lordpin.com/calisma2/files/uploads/meriwutoxilunawezela.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/foxokolo.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609424274fd04---18569525475.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/b88ba853764bae6453eb0c94f68d9cc0/68348800398.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/torot.pdfIn PDF document text
    • http://fitviewer.biz/files/file/lumadotegusitir.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/38858003254.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94bd94923b---suwoxebuluzigiwiru.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/93755842992.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/d520drdn9q4f4n8gij4ab4hsnh/74908322020.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/lujuzobulexuvumasudima.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/wopaxoxexesuzu.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/c98da8cc25c1adb7b65e7e9e7c568233/49023126726.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/dnnvuf8tnu3m7vmddcg98ecqgc/97892735383.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/punadonederovukel.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/79508249312.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/0508b95c53619d02991003db03156be1/15054007557.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5df48702e---49139746853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=palabras+de+despedida+a+la+escuela+primaria+por+un+alumnoPDF 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_off0000e70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70B 18308 bytes
SHA-256: 5530cb2d074e8083208c73939257626d242db70521329416e286adbb2efded48
font_01_sfnt_off000114fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D13 10816 bytes
SHA-256: b8666c7c1215882b05497dfd48896cec5258567548b45c34039892cba61964d7

Open this report in the interactive analyzer, or submit your own file for analysis.