Malicious PDF — malware analysis report

Static analysis result for SHA-256 71abb1ce06efafcf…

MALICIOUS

PDF

84.8 KB Created: 2021-09-07 04:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 157a9b23f518d906b67421dc5ac23265 SHA-1: bae2f647744a7abc8ee67fe7a6b590e0c91b5ee5 SHA-256: 71abb1ce06efafcfd34101969dcb5809094a89db046b2fabf6777f2bad8ea2af
156 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to various external websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://odlingfamily.com/userfiles/file/tedeginajolotewup.pdf In PDF document text
    • https://fertilizergranulatorprice.com/d/files/tifopuwiduniluferurusos.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/bovopug.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050111202731.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1611cdf361675e---sekezinadubotojerodijod.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/migegosetor.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/87932291595.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/somubupetivitenu.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/13812878671.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/8c6fc21cfe5eb1e2da7be7cdd7d1968d/zedofigolixesajewetufi.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/sasizi.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612e882851d90---13179481955.pdfIn PDF document text
    • https://littlelightnepal.org/userfiles/file/27263955251.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/82530179982.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/giwipekoruzi.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbf9b1210f---bibigetagifomiwifig.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/jo3p2951qej7nllj8ufpjgui77/xuzugava.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/tuzakowaz.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9438040595---worutumokudusug.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/220a59aafd73bcd37ee5444474fac3e9/74823936874.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/22526051313.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/73236487750.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/3juucaql6dt687llnma0mlaqsk/15084818186.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160aca448db73c---busalufa.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/xagevagipinezutavex.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9757f4e391cfd8669fe1767e77078137/xegaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=create+fillable+form+pdf+macPDF 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_off0000e7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A0 17512 bytes
SHA-256: 996194944fc2d02902bc116d1cb43377988a6955ea72d269404c15a7838fc0d6
font_01_sfnt_off0001151c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D33 10680 bytes
SHA-256: e8ea04ab9b0c552531158c2c5ef30c90803912f474e0cdca6061e4de5649620e