Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d80b3b1d229ef87…

MALICIOUS

PDF

85.7 KB Created: 2021-09-04 04:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4c8f8188a1a282465ec97ce6f283abc6 SHA-1: 06f95c1a496288f3da1432eb8523e326f46db450 SHA-256: 7d80b3b1d229ef872f70e96a0113ff33555831f3cf0add436e4e54cee7d13798
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/e1e4db11339997bd64daa2f007c23edc/90988547717.pdf In PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe2794bfda9---88156917355.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/tudanupovorogug.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160edfa94ef0ab---mekatavimola.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8547d34348---duwupowojitugatijisalame.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/c911210a1d7fd8bcb1553bc24b7b7480/monidimovoxul.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/75841106473.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072323c149e1---birezeseriwuvanoduvu.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/nodubimitof.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/8337adc68964179675ad66c25e6ab9dd/51552906384.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/kanovibubumaripukoxoma.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210829045520.pdfIn PDF document text
    • http://heizler.hu/files/file/riwenulajejewasigag.pdfIn PDF document text
    • http://retailcop.ca/files/fofijizu.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202108142108203591.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/7d70e707c2b04a164456eb05960281eb/zuzevowodivuzinukit.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/pejazer.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/gekanunokawerutekuzo.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/govubuwamovajeduw.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de6dd124f24---widanususimune.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/fedarak.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cc07298beb5---6995363541.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161107bcf0d77a---76850822279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=lite+pdf+reader+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://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_off0000e065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE065 22312 bytes
SHA-256: 95f83a880a8be413934d49d4532d3945ad7300b34cb86cb5335671f5f2fbdd7a
font_01_sfnt_off00011ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC6 10104 bytes
SHA-256: e6b56c3861529f06338f5f34bd98d4b8c124deeb41b0391bb850b18fca07c2a2
font_02_sfnt_off00013170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13170 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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