Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a7bc4e2f14ab941…

MALICIOUS

PDF

104.0 KB Created: 2021-08-11 11:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ac8eade408a5245911a629e0e98c8327 SHA-1: 4f73c818248eefbf6395a6fb56b49374866ab682 SHA-256: 4a7bc4e2f14ab941140f1fc9da4b65e17c9fd5b46f704f9db0f999cafd8c1174
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of multiple PDF link farm heuristics further supports this, as these are often used to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://satbietthu.com/luutru/files/29013000617.pdf In PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/5dc3cce2472151b1b64b97493ecae7e5/fogonisomapuzuxemej.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/83641001896.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/71633894922.pdfIn PDF document text
    • https://arerp.kr/data/file///96638606284.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609db139b7cc6---2029049543.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/13792321242.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/tujuzenodonujowobizegiwu.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/tijimoleneruw.pdfIn PDF document text
    • http://giaoducvietnamtv.com/images/ckeditor/files/56884267265.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/tnoc2e8ddk9o0sa2rch88qj997/tozetalunepexegagofuk.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/wemejemumota.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/8d5548c5dd0994a513d402d0a854cf9f/80461604294.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160beb9ad6ee51---pojoluran.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c548c16183---gobogat.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d0e327ab90---wojodi.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/18mjuh0tukgdvic4a0er5ovsu4/totevuwitopitiwozaraga.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/93134505946.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/4p7u5h2lvtbg4dbkm0fjcev6n5/7421901497.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9dfa2b9fa---lajuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=octane+render+4+cinema+4d+r20+crackPDF 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_off00010611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10611 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E28 10636 bytes
SHA-256: d8436a092c9acf43b0863da08757bc14ec698eff6c255ed1df91aec6f0b2f093
font_02_sfnt_off00013694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13694 17600 bytes
SHA-256: 063bb5bb017f76c976844587e5cfbbcf56bab4cf969d825ca6801629cd8e4f31
font_03_sfnt_off000163fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163FE 13208 bytes
SHA-256: 4062a8647631ef998b9903d06f8dc2d34b686e735707f569405e5d76f6630e09

Open this report in the interactive analyzer, or submit your own file for analysis.