Malicious PDF — malware analysis report

Static analysis result for SHA-256 c67d5f5b5bda7969…

MALICIOUS

PDF

71.2 KB Created: 2021-10-02 12:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7678c84e36802d663760c9cfcab58476 SHA-1: 31c3a224ce7cbc5aaf5c48c185b8d66cd357f56f SHA-256: c67d5f5b5bda79694445e3cadd35cf0be819d49da9f5f40cc48ef43c640b4ecf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, forming a link farm. This suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://pixomot.ru/uplcv?utm_term=difference+between+anaphase+and+anaphase+1 PDF link annotation
    • https://radiosmile.hu/upload/file/12549146697.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/zakaneka.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/pamijujokivatemora.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/9c83133e9d1cf5e1e50a69a43cb7b9f6/34584462679.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138418193266---82294681940.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/fitolo.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/83127750227.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/18265372575.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/wemolagipinedofegez.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/jirekipino.pdfIn PDF document text
    • http://spakimthi.com/upload/files/zaxegedukubufokib.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/kefukasifobiw.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/bidegosefelug.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/8f4fd67675b3a59bfcc9d4e94d90a6c3/vuxajurimodawosutifak.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8a6cfe44636ed032401de1b7657c74b4/79626763543.pdfIn PDF document text
    • http://teraval.cz/res/file/tutiruwatopefomux.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/59963333840.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/kivedoruwugesofelogana.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/47379944698.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/jetimezuser.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/99308778924.pdfIn PDF document text
    • http://voijin.com/userfiles/files/73019441576.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/baselebigojowiwezurizop.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/xeladusifadowe.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/35289957591.pdfIn PDF document text
    • http://irfanmakina.com/depo/sayfaresim/file/jolelawuluji.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/87076417745.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_off0000b81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB81D 10832 bytes
SHA-256: 2b2da53fc4f439f9fa3f449abcbe1d37cf105bf3472f0febcde30b00bf576ed5
font_01_sfnt_off0000d0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F8 15044 bytes
SHA-256: f13950a83a0d989483a156eb628f917ece8a7f01ff40c3d0e0be5a09bd96e5ae
font_02_sfnt_off0000f6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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