Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d70ffb0011d52a1…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 20:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 65cdf8191e8e6cf1773479192003f04d SHA-1: 219cf1c4a863a0deb9606d8e81d51ca0f91bafc0 SHA-256: 7d70ffb0011d52a1c426fa800ec7ee22178a4a95a007c470d1e49f52ba24079e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the primary attack vector appears to be the exploitation of user trust via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=android+anime+sex+game PDF link annotation
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d386de702---gokojetu.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1169d66cb---86425171897.pdfIn PDF document text
    • http://ijfbn.com/editor_up/zodakow.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/22293466212.pdfIn PDF document text
    • https://keongracun.org/contents/files/38924594445.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109061757470379.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210910175906173.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/bivukitadajazawafeba.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/83197018445.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161372e3b74c85---wavilokuzuni.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161409a217ccf9---33070675825.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/misanonapejize.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/23322359424.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/subimepezejeloramurid.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/66167892018.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210907070855.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/52462166496.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/66577874476.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/zejowinoka.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349203543fe---tafolovaxoxifiriloro.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141fc5e6da68---miruxi.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/valujusul.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210906185542.pdfIn PDF document text
    • http://www.siposferenc.hu/html/jejijezez.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_off0000e2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F4 10532 bytes
SHA-256: f019f89355de739a9117c6b8b3f0f566a06aaf02f19e7fa63a59b187300da897
font_01_sfnt_off0000fab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB2 17436 bytes
SHA-256: 0003f8bc2e4a57c2aa9442660a9fe20a9daa4873e339e7a11fbb9f02b8cea707
font_02_sfnt_off000127ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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