Malicious PDF — malware analysis report

Static analysis result for SHA-256 4378d6382131b281…

MALICIOUS

PDF

101.4 KB Created: 2021-07-24 12:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 7f689225c33faeb8da690914fb93ee6e SHA-1: f0a87c541f35310a03487e3866efbd84cc7a1400 SHA-256: 4378d6382131b28172df5cdc16205766765ae5f808d685d95c97c15ce22ea973
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 0.9968

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d068113dc5---foratikokepiteridusixuw.pdf In PDF document text
    • https://agentcctv.com/userfiles/file/48303379627.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/55991420822.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160b46960dd1aa---pusefidovukowulenibidam.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/2ged6fq9n37ep2j5qp7evafq6u/30081809441.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/ftsg6m8fjev8vfl1ons07n2unu/borobatowirudutoro.pdfIn PDF document text
    • https://artbynela.com/uploads/file/90880858506.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/49114046708.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769d55235e5---50163670463.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/gadevatitufitigukukenovu.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/sonurisumuzimi.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/zumoxikagukalilep.pdfIn PDF document text
    • http://xn--80an2aej.xn--p1ai/up/file/36934281584.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/farejonatedolenituto.pdfIn PDF document text
    • http://allycatering.com/userfiles/76358175951.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/divafutenevoju.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/den0fbr6cen69q1i7391flbrtk/64759594399.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/78694234d208cb9c1bfdee075eacd2d0/kobowikeximokiwefex.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/cdf4905334b2d829540158b6e859ba0a/tiweliselagojodeforune.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/4090aa21bed3a70be76a84e578c2946b/97160143456.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/sudib.pdfIn PDF document text
    • http://normel.org/files/upload/file/dabezunavunatebopalilir.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/41521615375.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c90f3d285---fujereloxujexupigosoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=vhlcentral+answer+key+spanish+2+lesson+8PDF 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_off0000f7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DF 12244 bytes
SHA-256: 3c9a0f10ca4fb2515af4ac64b8dbaafce44eecd3b050b64c0ce90f66a57ea96a
font_01_sfnt_off00011e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13671 11060 bytes
SHA-256: b31f9e6e063cccc9721ebd4232956bc745000777e4594ee4dc3389f817395a10
font_03_sfnt_off0001504d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1504D 22188 bytes
SHA-256: 7201f641c715f2ff116aa808e31ac6840c82aa79cc904a434f648085d27a4888