Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f2ede630d6ed01…

MALICIOUS

PDF

82.8 KB Created: 2021-09-04 10:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6983f231d0711920b446362ac9f89d2c SHA-1: 1bf44b2acd0cfa506b62c058ff3264e379d0dc38 SHA-256: 83f2ede630d6ed01707682501bd6714a5e72ac22f8858c3ab4177417d2145ce6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to exploit kits or phishing pages. The presence of multiple compromised CMS upload links suggests a pattern of hosting malicious content on vulnerable websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d06266016---78141397094.pdf In PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/2o6f1e64df2trl0nelmjbu7pl3/28709577760.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/marejuzadiri.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/38543017847.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c72b3e23708---12733374530.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/c188ee10c27ec618c813377ef4ace392/19625547828.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b462aef5bd---vazuwawakifebi.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16080b4c15a793---razunapagimikareja.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/bovekevosuzusotusezosi.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/0f0645fa18f2b3a76853edfbdae042cd/senagekorokofazaj.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/wokamakufusujisusona.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/pirusimamuwepaxir.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/madodilefovitisolawur.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/13215734427.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/f3bbc0780fab96feb7e43ae424ad78fc/momedewubutonar.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/vopet.pdfIn PDF document text
    • http://mega.kz/media/upload/files/zokusepufirijosofalugut.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd7d37a05a---24467656887.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/96637170735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=can+singapore+survive+kishore+mahbubani+pdfPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/xexomumiwusupilurazar.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

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_off0000db9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9A 11232 bytes
SHA-256: a63bfe27fe35bf030ba0f8c1bfa6f5fa521bfb3c74fd22389f1bf1f60d187a13
font_01_sfnt_off0000f554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF554 18472 bytes
SHA-256: 56e03e00dcdea5d9d042c2ea11e9f8d946f8d67714743d566dba5dbb1515e41d
font_02_sfnt_off00012599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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