Malicious PDF — malware analysis report

Static analysis result for SHA-256 8142a128bff08a27…

MALICIOUS

PDF

77.5 KB Created: 2021-08-31 21:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7ddfdeb31146b46195d0d9d5bdf558d7 SHA-1: 701c4943defa06301d82b591f033868666842bca SHA-256: 8142a128bff08a27c3cc7ef0ffb184ce662f0b45b4abb0836d37f8e47b3fb540
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that this PDF is designed as a link farm on potentially disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/cec113a8b5f43f00e3ae723636a0fed0/65506029389.pdf In PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f481185635---70111004695.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/ipi5f0j4rnintnqle4ul8baeod/82304389510.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/36305929928.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/41724404106.pdfIn PDF document text
    • http://cartopack.com/Images/file/juxupomudulofipisigu.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/45357566558.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/7fe741da8fcaf19c5f417e15a17095d2/ledewexusume.pdfIn PDF document text
    • http://parisplaza.net/clients/3/35/3561a7ce45da2f2f114a98ea6175a4b1/File/49745465292.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/wibaruvemusijiro.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/radaziwogomogaxut.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///21913700799.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/3340664329.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/4702166762.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/ba4c579333d15cceb05d4a9c2b5ac11e/wujibigikigikogululufi.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/20841773555.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/murezej.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/66721417292.pdfIn PDF document text
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/vubigunobamek.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160849ed3b655c---mosulez.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/4ff740945f39785794c111578d50d826/60435664235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=take+on+me+fingerstylePDF 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_off0000ca6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6F 17628 bytes
SHA-256: 5cae400d37db717e5eba3e82850fe8b90c97d1227c4d2733ab7c258eae49a304
font_01_sfnt_off0000f7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E9 10724 bytes
SHA-256: fe2cf038cbe1d7135c59cded93d5bee230e256a8986b23d457f83691da495fc4
font_02_sfnt_off00011097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11097 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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