Malicious PDF — malware analysis report

Static analysis result for SHA-256 211dc0d461b28848…

MALICIOUS

PDF

148.4 KB Created: 2021-08-05 16:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f2c610a951a6eca51099955bff4de112 SHA-1: 65d86d41a5cadd35ca9b887d7a6f108c178a6bbe SHA-256: 211dc0d461b28848a59d154fe59bb2fea7fa1998970facbd2f0cb966d962555a
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a likely phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, and the malformed stream length heuristic points to exploit activity within the PDF structure. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 8

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/j5igcc67robige7cjt3ju9ejq7/59707209585.pdf In PDF document text
    • http://perles-del-beya.com/userfiles/file/25261612557.pdfIn PDF document text
    • https://eslms.com/userfiles/file/mirodoluxadapek.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e1d3f4a8152cca5aaf5170f9fe638fec/83297227535.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896748ca522---30105880241.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/8706859492.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/b9afbdbbd3fcdb7ad969f5c0484c1642/4605364148.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/0d7184dbd138d659c3a01259213d7e3e/wesutidereruvozika.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/a0sjuu8bk2r2mhq9iqlo2pkhq7/673049446.pdfIn PDF document text
    • https://viettrungson.com/media//Files/dujaxavikumi.pdfIn PDF document text
    • http://holzbau-napetschnig.at/wunog.pdfIn PDF document text
    • http://yuha.be/_files/file/goxokube.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a291f315407---dojanexorew.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/9d142623f444453a39a83d8fbf81aadd/52856650920.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/79450517832.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7a5338206a6d33a5662d4c700857f80f/5493419229.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/55473590567.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160874c3de0df1---digogumixemeromemewadan.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/25993951894.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/vunetexedomonezajajulu.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741172d1dd3---19319409113.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073d3d88c778---24489999428.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/e1gqnh11059squtk5rs5mq7rp6/67796141415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=el+laberinto+del+fauno+pelicula+completa+online+latinoPDF 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_off0001e1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E1C2 10836 bytes
SHA-256: 032d6c7580c8159b8e0c32edde0a4eec9385edf6f799d762bbec4f53a9a99e54
font_01_sfnt_off0001fa73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA73 19084 bytes
SHA-256: 8dd311a3b5b333f96015da723c3bf66f919752cd191cc4229dea0bcf7f3a75e1
font_02_sfnt_off00022acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22ACC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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