Malicious PDF — malware analysis report

Static analysis result for SHA-256 399ce91eba17ee6f…

MALICIOUS

PDF

142.9 KB Created: 2021-09-07 13:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ca84ba7ea9c94df6162dd6cc74be7e67 SHA-1: b8496e5d4fa288a53a137fae5dd4bea1731ad47f SHA-256: 399ce91eba17ee6fa9878ba3c4c47d0819b8edc859ac47aa480ad284e359be88
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a variety of domains, many of which appear to be disposable or compromised, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

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://smidgel.ru/uplcv?utm_term=elna+614de+instruction+manual PDF link annotation
    • http://muntepa.com/userfiles/files/30085237000.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021080200093695.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/limijuzajon.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/34457309291.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/20133457906.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083be485c27b---makivexawovakexugajaduban.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/rekive.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c0948b7db63---42142629974.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/45434795210.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/foraparidipur.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/a1325f84e5cc633d42edea3a0dc71b39/3225643635.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/be7ssdo04er498h0mcd53o2p1f/gotonuxonafisas.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/julexemevakorasetusemoso.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/60585454395.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202106042147557997.pdfIn PDF document text
    • https://jagamimpi.com/contents//files/nawojerosikod.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/vakenegepipigur.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e7d1500037a---45469299501.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d0fa5156e---5140761278.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/besilebavozawibovifajidiz.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ce448f9cc---72099674069.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/39803158433.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/kozisoriwatirevote.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_off0001cb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB8E 10912 bytes
SHA-256: 64fa5d10a22b264ded9c9ad7c6813aa0a6fbc8870276d9ba92293cfbf9e723d3
font_01_sfnt_off0001e4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E4EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001fcfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FCFC 18552 bytes
SHA-256: 7f466cc2a305dc169880454ccde4f844157e4e6a4a966799e6f452f63d54539f

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