Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0134b4d8e1a41f6…

MALICIOUS

PDF

70.3 KB Created: 2021-09-30 18:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 64f69323f13732273eaf901a60f0893b SHA-1: 2bfbe87953f0cdc7160f97c7e85a2af26b782a65 SHA-256: a0134b4d8e1a41f6c8c542a6202c9bd84180af220549b37253507f5a9bac0202
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://quiltingacademy.info/fckeditor/userfiles/file/xozavolud.pdf In PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/wikugode.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/58621904094.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/15971743907.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/kavidiwogonibatozoxipus.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/31773202783.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/watavomalatigojow.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fb21c535a---senopumaxed.pdfIn PDF document text
    • https://jetaime-shop.dvsportbg.com/files/150850628.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/zuredoweluvowitogapibo.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16146a8d07314d---14355788597.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/64671957542.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/84401520901.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/jidenanigebosovixo.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161367ffe410a2---sowanuvarul.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/39866873306.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/govivabuvobesanor.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/bezudolirotatowifovokok.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/jinuxuzeperog.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/f9be3b1a399d0f2e3abb8e5cba85e1ff/46328801953.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/59566580736.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/92347944509.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/28325273867.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/xepuzudimoto.pdfIn PDF document text
    • https://ms1oke.com/contents/files/79292908175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=watch+fmovies+online+freePDF 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_off0000b4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD3 15248 bytes
SHA-256: 55ba5e088482e612d9e53a4c69726a9195eceabb126fa874373e00ee584c642c
font_02_sfnt_off0000f355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF355 10660 bytes
SHA-256: 0a6468492c019c93924142e424d7b8e2001070cb8d495fea4d3274a082360ea7

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