Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8fa8b9c978cdbee…

MALICIOUS

PDF

79.0 KB Created: 2021-08-13 17:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7bcb150095dbdd47d5a9fcf619fa78dc SHA-1: a0a343a21bbda3543f18b477c3338107432c7ae3 SHA-256: a8fa8b9c978cdbeecdc85df3f3e9bd437c284b9c03220c6f47c98a709bedb496
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for 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 0.9965

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://sjalikave.hu/pictures/file/31194045866.pdf In PDF document text
    • http://zimmerei-possert.at/98855267196.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/fixefesexaniwalosamamowon.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/gerezan.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/mivulivixi.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/93712070402.pdfIn PDF document text
    • https://kildevangen.dk/files/72723060815.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/43827319503.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c52755ca5f1---geduledefabuvakinexirot.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d1982670c---penejavexitemo.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/dafasofefobipexubevegu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607851b132b8a---80086743147.pdfIn PDF document text
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/pijafube.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/65b78f8ef47e291589aee3b6c9e10c19/27867727575.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/57224296830.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/0531b828259e372c96186af26c69006d/zuzekogetefivoboruz.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/34530111269.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd9ab64ffb---daxamanebilukitajiwixi.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16090a1b3c57a2---29851920689.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/pivikakonidezodibed.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/83099634237.pdfIn PDF document text
    • http://pk.mo/userfiles/file/66819811524.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d894e403a---4090439369.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210726104239441.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/14306354398.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/58373603296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=dnd+5e+spell+cards+clericPDF 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_off0000cf3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3E 17332 bytes
SHA-256: b90dc6aad2f1debd9c23445f06557dfb0667e4f7aa3598b90b41eb66e79572ca
font_01_sfnt_off0000fcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E1 10424 bytes
SHA-256: 04ccad23a5550abecdd825490e50fc82f8917bb2c37fe61ab8e9ef789e9d9605