Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7dd48abcfd34fc9…

MALICIOUS

PDF

91.4 KB Created: 2021-08-10 04:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3dc2d3529bbaaa8aa4aa9ae57172c550 SHA-1: ce7b753beb2c57671b2243bea9041fda828bc30e SHA-256: c7dd48abcfd34fc9a6518e9326e154355c36a6b75600e3c44c010bcfd4c604fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to download further malware or engage in phishing activities. No scripts were extracted, but the embedded URLs and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c99f451b7e84dc3280d01b8a2440120c/duredel.pdf In PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/2nr0shu6dhhau1uget2pp6b4aq/5272382271.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/5315352029.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6e09c433d---vuveromabesupo.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6db244682c---bosolefakolarajew.pdfIn PDF document text
    • http://70sromans.com/clients/871711/File/90833649310.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/2b0e7a999b558b14032e8e42c719877d/wusug.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/87392357455.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/kemuv.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a39cb2ae7e8---94519724651.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c520dd8d10d---dekixadixitejapip.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/jojadezadoji.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e59a1c432d---52062590357.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/98060641412.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c55d07aa---59391578087.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/peremugopebovamujilerune.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a786d2cb467---lanus.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/fidobejeribe.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/4947508316.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/75442667713.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/jimubo.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b09a3c2377---kubebilafipoxezixa.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/56513969533.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210810051807128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=patas+arriba+eduardo+galeano+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24C 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_01_sfnt_off0000f7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C4 20696 bytes
SHA-256: 04e09f7a7207d3f0dc17722b416778dc98ceb612bd8695a0129d7af5cf3b1f4d
font_02_sfnt_off00012b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7D 10916 bytes
SHA-256: 37f1f5ac5fcda38ca008da6f3539c0ec41f40409656c67119227c8da970986c2
font_03_sfnt_off0001446e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1446E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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