Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa1eafc5953fd11…

MALICIOUS

PDF

88.6 KB Created: 2021-09-13 04:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3df52915b483c7bd60b894c829ba6eeb SHA-1: 2bcc515ff49962baff7289e9e06328b7ed6f8e9e SHA-256: efa1eafc5953fd11482005cc0945f1f501d7ed0556a333b9fdf2d84d1b1054d1
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=monument+valley+1+apk PDF link annotation
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161315958c338c---4478464643.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/xebirimemerobugomijafit.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/27955330519.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/44965432415.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/zuwaw.pdfIn PDF document text
    • http://inercial.es/uploads/files/kusabaleradomixexo.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/14186168555.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/9860360003.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/fitid.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336cc91f2f4---86527941863.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/50708514954.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/dorusavurebike.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/47468141794.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/dizevapo.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/02939577b91f44638b4b37725bd4e783/jadeniruriwabem.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/tezebiwakoniladu.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/semadowafigefidawixud.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090613514373499.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/23712505037.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/90864664213.pdfIn PDF document text
    • http://nscenter.cn/upload/files/dezamo.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/dabijolutibabageki.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/davokisatemozijaxulisad.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/81506315306.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/gavigoguxagumezen.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04B 17484 bytes
SHA-256: e287efce32a65bd241591fb3a78a7253eada52e788a33c2672290a28b424d612
font_01_sfnt_off00010e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E00 10472 bytes
SHA-256: b07c323e17964ab3272e671dd19a372e155c7bcae465d3c4cd264b128e704040
font_02_sfnt_off000125e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF8 16416 bytes
SHA-256: 0a7c40006fc27d51153b21d6a48ea79a8c7f146cc8b15030b343ea684e52a4c8

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