Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c84f64c55b7065f…

MALICIOUS

PDF

90.6 KB Created: 2021-06-26 02:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 890551be51d8440b68ccb4ae4e90e049 SHA-1: bc85163b45b14a685c89c1995ea6dbc83dffd857 SHA-256: 6c84f64c55b7065fce226f3f2cf974882a546f740c29a7b9c19dc1c5498080dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised CMS upload directories, suggesting it's designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the link farm heuristic is sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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 https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/210da5cf9164f54fb4cf51b0bc213cd5/83420190041.pdf In PDF document text
    • https://vntdc.com/upload/fck/file/vipilafupivebojitimukixez.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607428ab7b1ca---48562291801.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/2128d10193b45e219c7dea24c829d70c/78136644212.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/84903550301.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608abcd168288---gujilolivurabedojom.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/ce392126233d178cf42035afde928d16/52841522156.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/42802581003.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/13ab3eb5bc3d4d4289336600270feb55/vaporazakarubenoxupix.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/nomunimowikonasalufewom.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/77094441944.pdfIn PDF document text
    • https://kildevangen.dk/files/xerefirum.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a580879afac---wexogamaxuwodimivibisasuj.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0b8bc07d4f395a3b663dc2b4085ffb0a/zafodilepepisewibowe.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/97983928879.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6e71bbd16---levitivesixobinotoxivaf.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/6d6ac1222a1d1d433b1c4beb485ed803/77843565852.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b784114e0---53946485703.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160bb11181ea1f---28246365138.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ec292a60a---divik.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/bivumi.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/f62b6d44f728a95bc586b3a4606edf7e/58983483215.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5f5e729aa---24350357258.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d26f0642d1---tujimowulenegujesi.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/fanegumumusoleveler.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/tavemolaxojanigaferaz.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607344a8549a7---41178367715.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=motion+chapter+all+formula+class+9PDF 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_off0000e577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE577 11004 bytes
SHA-256: 3fa52d8554463bb6661eb39318c276be89ce164a7aeb56bb396f819b9624836d
font_01_sfnt_off0000fee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE5 17928 bytes
SHA-256: b63a63e0b36a90b9a4ce8057e7c65295c52ffd111b109937e8bf3d88b8c2a2d0
font_02_sfnt_off00012ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000146e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146E2 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c

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