Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8ca9a34abf14c2…

MALICIOUS

PDF

68.5 KB Created: 2021-09-24 17:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b93a88b924e89126391f33204fa2b160 SHA-1: 0a4d8211178fa128a9e71f1f3b501bc4f346278f SHA-256: 9d8ca9a34abf14c24147a44bfeb6dea4447700df7badebfa6c41945c4d5794f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of techniques used to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://olterus.org/contents/files/tozudumejevakogozo.pdf In PDF document text
    • https://intersat.lv/files/file/fotivadosujidimizomu.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-10/20210910033519276918.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a6223bbee8eb088346c69e79aaa25c67/fawamamawufenox.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161448454802a6---degilolobeza.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/51202790505.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/76026160556.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/86260823291.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/59e1f5ee26e6d13c25d6f840a9487ab8/lazepojaxetagu.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/25846827920.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/dinopotujosudoges.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/vojora.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/44422260801.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/47811216675.pdfIn PDF document text
    • https://maturana.cl/upload/file/nulewilosurigedetujuwub.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/zuxowuvofetaxedela.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/lesoxudodejetijarowabatok.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/8112278100.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347a7c99b12---xisos.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/72189761433.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/92010894492.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/11686440601.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/61384143bf8b0.pdfIn PDF document text
    • http://school15-tyumen.ru/f/62396580447.pdfIn PDF document text
    • http://zzquansu.cn/d/files/65391930491.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=foto+apk+downloadPDF 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_off0000b009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB009 15132 bytes
SHA-256: e11906a27fd0dd128ab813fae9bffedef76a3aa67d2394a711d3228a180d1ea2
font_01_sfnt_off0000d64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64D 10048 bytes
SHA-256: 7ad41a8b164b725cbd60c8dda3956178c74efb23e3c0b80938405f81b958a6e3
font_02_sfnt_off0000eccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1