Malicious PDF — malware analysis report

Static analysis result for SHA-256 10e909e70639d782…

MALICIOUS

PDF

77.9 KB Created: 2021-09-08 04:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 66024bb4fb758345a4885d34b719d2fc SHA-1: a1e62aec66be5213fa018cd3d9bf736e96a48019 SHA-256: 10e909e70639d7821ea2fa758af52f6ec34e360a36fdecf3f7ec23eedbbfb5e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous embedded URLs, including those hosted on compromised WordPress sites, suggest a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the attack pattern of using the document as a lure to external malicious sites.

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://krisoc.ru/uplcv?utm_term=transformations+of+functions+rules+pdf PDF link annotation
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8cf3cc689---12328303836.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/mojur.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-7///20217171438121934.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160848788b8201---xufejawaniwavevu.pdfIn PDF document text
    • http://wenfengsi.com/wfs/WebFiles/file///2021090303120146.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/mezuvoxajubejagire.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/98295178445.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9bf11b2f3c4e9d63acd086cbee9efa3f/24602159083.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/wadigobazizukitak.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/76899332985.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/70328120348.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d93951839d8---fuboridufiveta.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f0d364f77---13158950611.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/75976316244.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/05c6407fd9c74e5e264cc97e65f4a357/30070354323.pdfIn PDF document text
    • http://aimic.com/userfiles/file/29505394680.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098baab6bbbf---lelejesutawuj.pdfIn PDF document text
    • http://bwc.lt/i/35870930339.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/86475780004.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/funarulesevawokadipe.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/nepixo.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/nu480s3317r4k6ga5ga8kjhdt5/modasuzuninefodo.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/kogagas.pdfIn PDF document text
    • 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_off0000ca50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA50 10844 bytes
SHA-256: c3851abd8036026c78e7b9326df86a0d126003972582d9fd9a8de6750554b30e
font_01_sfnt_off0000e355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE355 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB67 17736 bytes
SHA-256: b4dfbd7527558e36c99538698c72af149cac0c8970c0e2914bbd6a3303f34aa0

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