Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8470ec7651ba510…

MALICIOUS

PDF

98.7 KB Created: 2021-06-30 22:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2afd83c9a944b1f4b24738f271d6f270 SHA-1: e761280a59ef82ebf9ec421958afda646d73cfa9 SHA-256: e8470ec7651ba5109f43c1efcfd81e855cdb4de93fd9e35f7519759877c1ebc2
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with several heuristics indicating it functions as a link farm. Notably, some links point to compromised CMS upload storage, suggesting a potential distribution point for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

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://twr1115.net/files/fckeditor/file/58995899534.pdf In PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bf273c852---wupexoxiwipumovovanozori.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-6-8/20210608030444154897.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/181689069.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/jowimaxitu.pdfIn PDF document text
    • https://brakos.it/file/vixojatirefotatop.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/79515776845.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/3b2debb2531fc7d805acbfce1181f189/viwowefitunabenenov.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/33335625684.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/88571312431624266098.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/24d10ed3709218d3797b99254d22354e/35305929123.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/nagotatakebukofusomomasid.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4c988c239---20992868906.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/16863518cb01bf1e96fcc801b406aee4/sevezu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160797baf672b7---batunitumibarefolive.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/52522957387.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/59441625403.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/69a69dc9f5c811dd4845d9318d808de7/81142519281.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/diruvepajama.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16089e28e20e5b---zimir.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/9e3e25627e9ae1164abbe6d5559cd4db/35353730896.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/5k8mb8310et1o7t81h9cd02hr1/pezebaxagov.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/jjs84lcppjauep1puf33saq659/tusid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=snooze+meaning+alarmPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011d05.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11D05 17684 bytes
SHA-256: a42af85dbfa65db86925e5410525060beb0f6ab3804bdd0e61ff9d3d935e1e2f
font_00_sfnt_off0000edb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CD 10320 bytes
SHA-256: 4a37c806a3255e0b02441edb88ed621c5dbc86d9712a8390dad91cbcb59e339d
font_03_sfnt_off0001381e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381E 3308 bytes
SHA-256: 3cd9501d9f5fc0bea03a9ae99846c232a31fbf483b9c3e9f01f22433a22025da
font_04_sfnt_off00014532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14532 22208 bytes
SHA-256: 7eed919eb1592744cdcf9942eba6bbacfa82d3d69121a50936e151ee43b27b75

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