Malicious PDF — malware analysis report

Static analysis result for SHA-256 7983c1e9ef1adcc8…

MALICIOUS

PDF

84.1 KB Created: 2021-09-06 08:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9ffebe4d1d3da9735000d7e6de6df982 SHA-1: fe3f42b37b151b3aa90beed1f269fe5bc4d6362e SHA-256: 7983c1e9ef1adcc87dbad78d8d36ed0979087777a40539b4f34905e5f45a3faa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript could be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • 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.
  • 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://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102d068a03c7---bizizivugatifaxoj.pdf In PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/92207771801.pdfIn PDF document text
    • http://seamacros.com/upload/file/53209086801.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/503g01mh6uk7j08igotm5a2vt0/57617851135.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/224775599.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/loxekimukoxuwajoru.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/58770347418.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/aad04cd424eb16f553c1a1287738e121/vunarizerixekideliji.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3223ac113d---56986891897.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/92883041801.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/godokowubujuxamefadori.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/28942726146.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/kozosarazopesinafojatojap.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52868e2af7---23801153323.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16116e47d23d31---putupatukozisetabu.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/94739ca039d5ac937e41aacf6f6a31b0/jododigupipava.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/08cfac5fuk23r08bmqvlapnjl1/83234177295.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/9abade6a837e6bdfb9419d52e36a43e9/diluxitabupijotabe.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c57cfea467f---mevamavivedodube.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/81298406783.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/rikesilavawilajisarodo.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607379a233032---92037383567.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/dikemizunomuwuvogili.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210820080904474.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/46085967399.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/repepowewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=general+physics+1+pdf+grade+11PDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10F 18944 bytes
SHA-256: c9dae8daa744f66a38531aaab019ff4e3c10b7b99995e96c294eb0d82d994f94
font_01_sfnt_off00011144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11144 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001295b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295B 10888 bytes
SHA-256: 9aaab0c2e300d73811169f47a0dc0a5fb115a06f3a3f179b40f368876be5aa4b

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