Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3e547b8d642c63c…

MALICIOUS

PDF

83.5 KB Created: 2021-10-08 23:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9a2899facb6ff11428add3bc69b5d3e9 SHA-1: ec49beffbaf5b4df7dd6fd7c2448d436d2c7077a SHA-256: e3e547b8d642c63c7d2440ee4af5cdbd004505dc792e45c26057617bf8f91498
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that function as a link farm, directing users to various external websites. Several of these URLs point to compromised WordPress upload storage, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://coretry.ru/uplcv?utm_term=easy+come+easy+go+meaning PDF link annotation
    • http://biemmecommerciale.eu/userfiles/files/29004985440.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/8jm1o5t176efse99ndvrdj8346/zuremebagulenumor.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/72145264988.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/27157244155.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/cc47082ef508561ee53850c92246ea84/tabazuwuvusebafufew.pdfIn PDF document text
    • http://espokebar.com/uploads/files/98259981091.pdfIn PDF document text
    • http://miminku2.com/contents/files/fenifa.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/3570344036.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/sukid.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161455c7eae753---dobiwimugafejivavefevo.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/8362266788.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394e53b3729---66005979274.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/fojol.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/tevusupoworevujov.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/vibekusexibopo.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/70579493240.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/11247472352.pdfIn PDF document text
    • https://davaocarrental.com/images/file/tutufuviwenozaradujet.pdfIn PDF document text
    • http://qdjshg.com/files/file/nojinizonaxe.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/movemifizu.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/dolifewuzudurarutar.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/sumij.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/77140690835.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/12528330423.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_off0000da52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA52 10424 bytes
SHA-256: 9eebd50f80666b0e3c5e7507c698b9883c3ab1964284523c9dff228964284e32
font_01_sfnt_off0000f1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F3 20756 bytes
SHA-256: b96769493862a4c48b458050bc914c61383869c4b5450fc631d1d09f2f14fe3e
font_02_sfnt_off0001287f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1