Malicious PDF — malware analysis report

Static analysis result for SHA-256 a716700fa4e4d96e…

MALICIOUS

PDF

81.6 KB Created: 2021-09-13 14:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 178164c652a596743d7230b82f4cb9bd SHA-1: 85b6b99d4df1150df9b53bc7036f3ce50d3361e0 SHA-256: a716700fa4e4d96e6b7b2be6f6e7e7f7d81eb4338312b45ff0410ed805cd75e8
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 link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farms on compromised CMS uploads suggests an attempt to obscure the true destination and leverage legitimate-looking infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://www.tahi.hu/ckfinder/userfiles/files/zolera.pdf In PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/98719293427.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210905174817.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/lerewusebotabi.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfe534eb80---jofusisomugomojugefu.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/tbskcto6sk2kps2qn1etd9n1nb/890907514.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/goxumobuzavane.pdfIn PDF document text
    • http://accronline.com/userfiles/file/29132262823.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/parurazawebega.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/45277684199.pdfIn PDF document text
    • http://skrn.cz/pic/file/2233154454.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/45525222302.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021090213371714.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/82207025139.pdfIn PDF document text
    • http://entrackintl.com/uploads/80887917652.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/senufa.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/58985789062.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/niveraz.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/ba4c2345f350081cfab29dfa345fe1e4/pekopuwedafogoxewuguj.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/tefaroligetubozarawuli.pdfIn PDF document text
    • https://masukpt2.com/contents/files/zibapagevukigekew.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/fajesimofuvedogekuvolow.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/worinituvibisabelufewafu.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/xekararegelepipadisani.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=screenshot+apps+androidPDF 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_off0000dae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FB 17588 bytes
SHA-256: f16b71349f034d60cdaa76f88cdceb20c7f956840f479b8266ba55d6f400eba6
font_02_sfnt_off000120c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C4 10640 bytes
SHA-256: 7878e0114242f3c8cf7a2e93dfbfd344e29cd0ab3d2c3222fbe3047e33784554

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