Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be313a9899a4846…

MALICIOUS

PDF

79.4 KB Created: 2021-10-07 17:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 516ce137e10349df4d8f2e90df6c3fbf SHA-1: 051af0df578c69aec30c4026a96c2e3447d5e138 SHA-256: 4be313a9899a48461cb147fb55fa49d24e9070bd22217fe1346877b166d57f4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=the+travelling+cat+chronicles+pdf PDF link annotation
    • http://yogo110.com/userfiles/file/rixivulexazeju.pdfIn PDF document text
    • http://haraj-alqunfudhah.com/userfiles/file/zasomelogijipisegunutip.pdfIn PDF document text
    • https://irrisyst.eu/files/file/tilefakirudita.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159f1946a2ce---66983139391.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/worelirexidapi.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/diziworokamakoxud.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/26765076055.pdfIn PDF document text
    • https://brukspec.pl/upload/file/lojitonikenupizedadupemu.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/sowodi.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/nusofim.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155a39f5f871---filijedupamatujegela.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/mujuveron.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/lavedefuboriwotuj.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/99355563917.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/pemok.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/cd8b46baddfa462f2e3297535a9a6f94/sakifititejapotupanepumol.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/20126358136.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/5109501745.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/7850296917.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/zuduluj.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/14064408358.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/lejetibefojoximalutef.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/68684284032.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/vivirunoxijazobosibag.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_off0000d0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0ED 10928 bytes
SHA-256: f06eeefbd9e2eea4bcc61ffacb4a3e6b046d99df5c95f38bc6831a2bfc3b6cd4
font_01_sfnt_off0000ea04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10216 17928 bytes
SHA-256: 6e8a1bdf179dbdef18a721883bd4552d29d6fe1370c55444d56c15321789fbd9

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