Malicious PDF — malware analysis report

Static analysis result for SHA-256 5773863f4519a30a…

MALICIOUS

PDF

70.9 KB Created: 2021-09-04 04:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fab78b297ab7c5d403dcae406c117fb6 SHA-1: 67db5b38ce5ccd8bb9a1b72c4260fc18ce98fbfc SHA-256: 5773863f4519a30aadf1e06d1341246354c84fd83d7d545ba0cd14662610220c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-severity PDF_RANDOM_URL_LINK and a critical ClamAV detection for Pdf.Phishing.Trojan. The file contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of external links indicates an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/85e1748201424d47a17f952eebfb6aae/29771364063.pdf In PDF document text
    • http://meteosputnik.ru/userfiles/file/tevowut.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/pm05gmjvb8qg2j9gb2c018s8jj/jarufovuranugup.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///wokagegem.pdfIn PDF document text
    • http://medica-brno.com/files/laboledulezew.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/e860a2764472ae2c73ee2037159a512d/86933565535.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/07cc61367d423c189f0f0de7ef1a558b/88013580060.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/pibodupowoduj.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/49342957486.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fab30cc7bf3---82998047123.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/54569581419.pdfIn PDF document text
    • http://zenithmetals.com/files/dapakurowamuzojedixa.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/23303187873.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/lajitezufumo.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/lajaxojuragotofukom.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/28227490654.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/89200779117.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/safokape.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe29eb4e76---fegapa.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/58517428974.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/lufikebizosudejutomuf.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/pulorog.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/roxile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=deadlock+condition+in+os+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB387 16700 bytes
SHA-256: 593a739939b0cdf7301a610880c7a895d9399771914dd7fdeb8c7cf8b2da3065
font_01_sfnt_off0000de00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE00 10608 bytes
SHA-256: f61c3d837c23332debdcc387f178a0bea0f69948679f409c08c55f6da67b5b01
font_02_sfnt_off0000f655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF655 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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