Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a089b12d4456e51…

MALICIOUS

PDF

83.4 KB Created: 2021-09-12 09:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b25731c191da1196e581ce54744648de SHA-1: f8f3a2bd7116dc46bb39b036298eac82372bd006 SHA-256: 2a089b12d4456e51517e8fac8e9e3679c3bd877183503b597094bf93d5ce315d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as containing a link farm pointing to potentially compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were extracted, the presence of numerous external URIs suggests the document's primary purpose is to redirect users to malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://arenabilardo.com/data/_files/49888270120.pdf In PDF document text
    • http://picassogift.com/Uploadfiles/files/62131275173.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/66991894258.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/jenupabukokavajebe.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/03/file/42794897494.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136488ce8908---tijepopawufu.pdfIn PDF document text
    • http://slsnn.ru/content/files/fidofatodafatulijavagedav.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/60307604850.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/59078108276.pdfIn PDF document text
    • http://minhanh.com/files/19578658507.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/72494965901.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/15417496654.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/73481837768.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/51783918cdf68bb5c0438ef261dd63d1/wovebakituluzux.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137f8d3e9e80---58061433905.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210901212746_209483542.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/39096019409.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/80145972056.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/kenewawopu.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328264052d3---13813048062.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/27248813637.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352ff49f382---mebufolozekuwokobegi.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/mixaxaroka.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/dixuxasibobu.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/gexixomubawuradebifikim.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/75076253535.pdfIn PDF document text
    • http://khocabien.com/uploads/files/lipagafibapusajujogojofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+remove+developer+optionPDF 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_off0000e159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE159 18228 bytes
SHA-256: 6dfc832fb7484cd9804f94952e65e25ec35c5a2b88e19d7acd0a660c0748b672
font_01_sfnt_off00011027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11027 10364 bytes
SHA-256: 8d30cf351ae9d9554fdfdc0c2eb5673b5b672224f6c58a236acdac23d6a73da1
font_02_sfnt_off00012777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12777 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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