Malicious PDF — malware analysis report

Static analysis result for SHA-256 f369b09ba3c310a0…

MALICIOUS

PDF

85.2 KB Created: 2021-08-31 09:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a24be5771e86dcb5d2856b231a70c684 SHA-1: 12a20b0fad521aca4f8bd0bfc8b18c87b8f7bdcf SHA-256: f369b09ba3c310a0340e318b86ee23797ac9015c372b2d5b41476d5b742174f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. No scripts were extracted, but the presence of multiple external URIs and the link farm structure indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c50cb360ee0---sakivix.pdf In PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/16499423279.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cf2a1743d---zusaxevebugedanivag.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/wagojowo.pdfIn PDF document text
    • http://hoacanh.net/luutru/files/kaxebadavewexodab.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/9114727444.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/vezitivajixowejajek.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/880e2d92494e470c9f9e9d771cc1792e/61159642635.pdfIn PDF document text
    • http://one9five.com/userfiles/files/21078747669.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712158b66a2---nesisupurakebenoz.pdfIn PDF document text
    • http://skia22.ru/pic/file/dinizejig.pdfIn PDF document text
    • http://dogable.de/userfiles/file/59214801264.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/d56qikc4lte5v52pjl4ngcjgu1/62368958041.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/e73e813d0185d4cdf78a407e928eb174/47280471339.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/14135131858.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/7f2be0c53681ef15e443d087e7066c7c/88989904783.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/1ddade05ebb5bfa99b10acc4060ec789/teregiboposiz.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/74bae48fb46c234daad1f2f3a90dad26/65687206169.pdfIn PDF document text
    • https://kawanmto.net/contents//files/jixidosebapimomu.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/6b2d2f5cfa8dca972287dbedb52e6a5b/gogevo.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160fb970816dde---saxekiwoterovasaxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=i+think+i+have+a+concussionPDF 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_off0000e955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE955 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001016c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016C 10388 bytes
SHA-256: c8b781617be49775ce91b76cf9e6cbd05f5f8030e4bd50ac613bccc47ca963c3
font_02_sfnt_off000118ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118ED 18340 bytes
SHA-256: 39f45b5b1878d792bede0b790be92413128c18dd732451333ad29c2ec52d1bec

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