Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e424a765219352…

MALICIOUS

PDF

84.9 KB Created: 2021-07-04 22:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 48e603add71f341b1b4675827e267fc6 SHA-1: 57df051f857b4de4afadb6851ebbd84629e394d1 SHA-256: a7e424a76521935216e036fb3f59f221d3e69117f929fb72b915431d33966e9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://camwater.org/media/files/69317741017.pdf In PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/pfblfj1o703bo58bmsq0e676ue/xatovog.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/dl8drnfmt6tj0s3nl6biqop3r1/37661938681.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/60001091097.pdfIn PDF document text
    • http://bjallstar.com/upload/file/17826669038.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/de928a8b5fe667ecfc677119b1a39f63/zesikikabegimerakevafalar.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/72253191548.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zukolutazuvorov.pdfIn PDF document text
    • http://cepsagibyachtfuels.com/images/photos/83621600110.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8329453baa---17674189833.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/8c05f5135530d35e924bb1c9a020b82a/51038859459.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/tedifadesegelijizodofokom.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/ronusemeg.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/966e69c90d6414a33930f8638c379e45/lojogaz.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/7cd18da24bd0ea15144bb424832b4b5a/56589174797.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/clr6qjf97s1783bgl8i3c1i3n3/57526611226.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/89359908441.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af04f119e5---muguzukiwujofevijowi.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/87160539258.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160adf600d1660---retaxit.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/n1oct7be9svat80gmt2mh7qq28/90583485060.pdfIn PDF document text
    • http://axwelindia.com/uploads/zususepotivivepo.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///zewalabune.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/dalanixexuji.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/d3b895cd512191616245cceb69454218/95359506303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=shaven+and+shornPDF 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_off0000ebf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF9 10252 bytes
SHA-256: 172bd5a2801fd74aa7027ce865da293d1ddf3f7985e35876608cbd02f0e399f8
font_01_sfnt_off000102e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E6 16844 bytes
SHA-256: 0cead3c905d5a324cfb7ad10fa4cfe07855c2903af553d18b3e36d347fa26233
font_02_sfnt_off00012eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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