Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a876bf97170935…

MALICIOUS

PDF

92.6 KB Created: 2021-08-01 05:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 42807bbfec6bd9c33d000f9c63e2a0f1 SHA-1: d3158cb0ae0399b0008570214f4dcf86d4e1d34e SHA-256: 80a876bf97170935901845f21cd7efe4e422b5c32325810938cfd4c745c01c05
164 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, likely serving as a link farm to obscure the malicious destination. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution attempt. The ML classifier also flagged the PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b22ed8eb084---tifubufagi.pdf In PDF document text
    • http://agataklimowska.pl/userfiles/file/79587296300.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/vupojerifagaxibidenig.pdfIn PDF document text
    • http://keacg.com/upload/files/sumitojup.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae670a47e9---jokegasuta.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/0r8ju2gchp55r6p3qa8s0rirov/mukesefikugovogejaloba.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/l2ivf9rn5rpth8ppcdbqm5tf93/nudemiguzugemijeredokope.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/165e92cff6e302bc9eca2c548aef3061/latigisimigozigu.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210713_98DE957FD7800111.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/danodudezatovus.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/01cd54a3583ed6e8b1a4dadde6ae296b/gamixuvesinurujefexulun.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f149e129df---49945614992.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/0d6c90fcbdd312d06174c79371c920e1/51361939638.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/91702914824.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/37279665419.pdfIn PDF document text
    • http://kd-council.com/upfile/files/80503652422.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/marasupubolif.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/2612be1fe347c8e6432df593509ad2f7/gofaw.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/wovuxoji.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823a4587f8d---9820049538.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/duxavozuxasumajavaveta.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/xevuwadiguz.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081cda857e45---gaxefupuze.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/88904970134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=oz+the+great+and+powerful+movie+download+in+hindi+filmyzillaPDF 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_off00010477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10477 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C89 16988 bytes
SHA-256: 67870c5f86c152146f382ba865906703816c50006209b21754dac678b3b4d68b
font_02_sfnt_off000148d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D2 11228 bytes
SHA-256: 2b4135b119830186d3023973e8b9391fd4b5b96697528d531b01cd6e20e37745