Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c8c308b4844177…

MALICIOUS

PDF

87.4 KB Created: 2021-09-09 17:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fb1c03b8de67b4ffcbc8a593b667b60a SHA-1: eaf67b4439df9d89e8270ca3a349732a0642044f SHA-256: b8c8c308b4844177c21cb9b866f2ca170769e4156455ab2578bd44157f08c4f9
176 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Several heuristics point to the document being a link farm, with multiple URIs pointing to potentially compromised or disposable hosting sites. The presence of a raw IP address in a URI further increases suspicion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://bellamy.tw/uploads/files/202109082132125751.pdf In PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/75608106854.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/vifonozepaxadid.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/3917899874.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613530a74d9e0---22743467047.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/vopebowewukilalibiravafi.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/44187850840.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/naxuse.pdfIn PDF document text
    • http://gibisch.biz/files/files/48928402552.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/pamupivu.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/57271423567.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/gakifuvulevilewalox.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e42d9080103d3c41383ebb8f2e59e406/kuxoveliruduzejapekubo.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/vevegimuxafejitozek.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210907_052158.pdfPDF link annotation
    • http://pileshoppen.dk/userfiles/file/81261699372.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132083a09b5a---25025388394.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/jipubufakubijirotos.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/66397422834.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/navitizoguzakamofukesinub.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/jizozub.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/28017687259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=imo+apk+oldPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD247 16164 bytes
SHA-256: a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1
font_01_sfnt_off0000e7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E8 22696 bytes
SHA-256: 89fc6cd8506fa6ba514509e115778b1c800c8b2221e42187dea3e33342d3765d
font_02_sfnt_off00012259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12259 9904 bytes
SHA-256: ff3873d47b7022642887a7b871913a46721d7f5481df5663b59351d953f407d6
font_03_sfnt_off00013826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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