Malicious PDF — malware analysis report

Static analysis result for SHA-256 834be752a1202418…

MALICIOUS

PDF

75.5 KB Created: 2021-09-17 17:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 0ba6d955488006bce3c5b5fa5e3b67fc SHA-1: b30c6b92f3509ae4dcc2bd9753b3643fafc98840 SHA-256: 834be752a1202418005c9ec52162b504b511329382b56163aacb05118e90d152
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and link farm patterns, suggesting an attempt to redirect users to compromised websites or phishing pages. The document's structure and embedded links indicate a likely spearphishing attachment campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://krisoc.ru/uplcv?utm_term=what+is+the+collective+noun+of+students PDF link annotation
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b33f0f2e8---21938961579.pdfIn PDF document text
    • http://yjbiotech.cn/upload/files/misumojox.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/bozitufiguwezunubezabe.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/77860089552.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377da00978b---konawitirobevogujoko.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/56269187413.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/83872475939.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/tiwowidexizuwuposis.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/bapuse.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/70947380608.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/8795331764.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/76658962390.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/jususexep.pdfIn PDF document text
    • https://voxel-avocats.fr/uploads/file/In PDF document text
    • http://munnarinfo.in/userfiles/file/kijimoxe.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/lujemug.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/lodafiwitudopopagib.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/savatujetelidat.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-08-15-15-32-18.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/uas6i1sq1i6uopeqb4tglnknno/benimikisekeropezusutani.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/bedutikadilunesik.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613169530f1b8---11637710858.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/xovog.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/79313264815.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/22526659654.pdfIn PDF document text
    • http://synowka.pl/galeria/file/bapololotelajorikefa.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_off0000c38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38F 10632 bytes
SHA-256: ff875e5a75d477d4b0e99b03bf5e0f3db120190027fdccfd9638d020b56235c7
font_01_sfnt_off0000dbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD7 17164 bytes
SHA-256: 3630a26ad5954a65fbc624cc5b688957557e02139d581a0d8f51b8b41e92730e
font_02_sfnt_off000107b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.