Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c984ab57c1bbb2b…

MALICIOUS

PDF

80.5 KB Created: 2021-06-17 23:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 9c8adad77457c10b75ea8d16b3e58faa SHA-1: e2d70c5421156b4b38a90c4b5bdb0ed2465cfb51 SHA-256: 6c984ab57c1bbb2ba276beff71e08601daa928a58937b4a01f4a44cfc84a6454
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution scheme, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0660c1ccc6---9961098624.pdf In PDF document text
    • http://kppzp.pl/userfiles/file/gexutakogufo.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a4965665bc1---34196171265.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/77256623676.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094274a4ffde---65723510881.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//59454327567.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7fba07a8b---94316032814.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef772920fd---86363367820.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/2da667f95eaca456bbccb3225be5047c/76122122020.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/90263995449.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2b64653d3---2843083428.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/c16a103dccb323eafda048477ffeb5f5/jugumufenit.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d05d3461d3---30562724923.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/dafuka.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/fatipapapulorinumufosuba.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/77124575767.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/16b1fb666b4fe08ca10118f3a5a7d034/sesukubejepijubudog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=flying+car+robot+simulator+mod+apkPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C2 4188 bytes
SHA-256: 2668d757040d9d4d178a14ab7af36deefa9fb04496b45cea75b678e7a0d4b419
font_01_sfnt_off0000e672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE672 5656 bytes
SHA-256: 5aa20963d1be9ef2d29ea9851aa39c653d5be122872b0d48bf155fed07a13fdd
font_02_sfnt_off0000f99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99B 7688 bytes
SHA-256: e031e5b5117cc93e513045c065b38105a1f672fa12b9aae03427d8b4cdf889f6
font_03_sfnt_off00010ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED1 10856 bytes
SHA-256: 872c09cb39a564e16f2b804ee38fe23ca6becc839c47fd82619ae1dea2b24328

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