Malicious PDF — malware analysis report

Static analysis result for SHA-256 242f163edae889e2…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 09:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 51607f2905407658da5d2ebd75e3e3c1 SHA-1: 72f4a7fa2ce7dd7d696372431462220345a49217 SHA-256: 242f163edae889e2e440fae63229d812cf895df2b0e564dcd4861f468b9413fa
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, including links to compromised CMS uploads and link farms on disposable hosting, suggests the document is designed to redirect users to malicious sites or facilitate further downloads. The PRC/3D content is also a known technique for embedding malicious content in PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • PRC/3D content in PDF high CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=south+new+movies+download PDF link annotation
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfef776066---gobugofegujog.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/dibidonudubovu.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/laxevub.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/3845461626130bc25721f7.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/taxuxezoxegupavu.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/sigozarevere.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/80116551751.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/31344115243.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/misefusifisenavoni.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/kokofib.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/sesinuju.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109080803542866.pdfIn PDF document text
    • http://pjteam.hu/uploads/gumolutak.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/kujigemidupamomekobugiz.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/58927780198.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/32686587804.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/guduka.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/15656458548.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/pogagalifesutup.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/bavilo.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142533332724---jajogexowubup.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/72a166620e82a679f3d481e4e02ff96d/wipiruvuzevego.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/zoripotoja.pdfIn PDF document text
    • https://dafelia.com/files/92799213922.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_off0000e19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19D 17692 bytes
SHA-256: 284c93c74efd4260330ede0b8b3568c1f22ce1e4f04e6a98d225dfea86f90e13
font_01_sfnt_off00010ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED1 10740 bytes
SHA-256: 09d4565b938d080c49d251f9ee7c99dccff9ca9dfaeef5e18d2ef574c438d940
font_02_sfnt_off0001275c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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