Malicious PDF — malware analysis report

Static analysis result for SHA-256 b783e3bbdd2d8328…

MALICIOUS

PDF

71.9 KB Created: 2021-09-29 11:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 77f4c8360b43c8c895ee239207bfd5d8 SHA-1: 88e5995495052588f52e5494be5fef650efb1fdb SHA-256: b783e3bbdd2d83281297908e17a1bb33f2f6428be95a2ebe77bdd02c2f65cfdd
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://wastran.ru/uplcv?utm_term=ashy+bines+free+pdf PDF link annotation
    • https://biholka.cz/uploades/userfiles/file/3898013754.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/57686970351.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gudopuxoxiw.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/gisafubunipidiruda.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/35dd16b18ddc17e3608240e9ae25e397/53857494336.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/46605388678.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210925135139.pdfIn PDF document text
    • http://land89.com/ckupload/files/kiwutefisoverorobutusili.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/45151317052.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/sulan.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/50914187854.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/934cfc9c5def1d1469f3ef2324202a15/63025227250.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/37444299611.pdfIn PDF document text
    • http://anninh247.info/upload/files/komewejumakugufumuwufet.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/xogekatejebotimuximef.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/13180882631.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/doroxemexebufuvenumegorew.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/ec3928135020349fcfa12e08626df31a/36770198970.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150b0fc809cd---30591027287.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/5526524517.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/12988221818.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/16126549595.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/1e3a74f4e7f0678d5711ca48a21f01c2/xitabalakafezekagokimadil.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_off0000b638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB638 17652 bytes
SHA-256: e9a6216cd7b9a6c24cd2573621d5e88e258eec25c0ec2ffa801b4cb9631f5839
font_01_sfnt_off0000e2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C0 10404 bytes
SHA-256: 3df8ad1c68caaefc6cae91f27244fe7ac8e292185d1cbfcca2402afddd953309
font_02_sfnt_off0000fa05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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