Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd13ff0ba0624777…

MALICIOUS

PDF

82.0 KB Created: 2021-09-09 09:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 48a5952fde54a1bc432eb00305a11588 SHA-1: 3efd36edf272e0801fecc3683b30c41d5e42d93c SHA-256: dd13ff0ba0624777ae515d1b98c6ee17d9a5217eed44c36f607690787c06f095
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of external URI indicators and link farm heuristics strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://synerhu.ru/uplcv?utm_term=pokemon+fire+red+mod PDF link annotation
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161372a21f20f0---40160463101.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/mafugadununisesudimomexa.pdfIn PDF document text
    • https://phunhai.net/upload/files/28958155900.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/vebifogigulejemog.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/notajanakoxavitev.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/bfb0ulh3d2rnsfdm06mm4bs5lj/jinogodetolodotilurulumek.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/sogifo.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/43124282384.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/jijadasotosulubilal.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613104aa0c2ac---12640754379.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/89464689033.pdfIn PDF document text
    • https://emprenderem.cl/files/25077792700.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161327ddde586a---vidoxozibiwe.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139378920114---47585937458.pdfIn PDF document text
    • http://designgaleria.hu/userfiles/file/mogona.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/0f95f38e3ba6a990c721b312f1f116ca/36009472565.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613760c36fff5---firoganofaboderekenok.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/lufarosapotezapasuvulun.pdfIn PDF document text
    • http://identik.hu/editor_up/17697303565.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/palowoso.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109032253352096.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210908_875FB6193378DE40.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/3720659187.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/20003207100.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_off0000dc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC44 18468 bytes
SHA-256: c9299000aa12b47a26fa017f5b9a7305ef30f5be2779bb9379a4aa64ce6356e9
font_01_sfnt_off00010c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C43 10136 bytes
SHA-256: 66136d8970346ddba1d59806a3ee3257b281ed02986a92920c67b5a84a55710e
font_02_sfnt_off000122d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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