Malicious PDF — malware analysis report

Static analysis result for SHA-256 58cbe89a734730d9…

MALICIOUS

PDF

83.0 KB Created: 2021-09-10 18:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 343925035bcbb536cea9dce72c721ad8 SHA-1: 0dee90e6feba42ae07b6d50c869ead6356a891ec SHA-256: 58cbe89a734730d92be69fd8c39101e43d0553b9d6ee5457a0129ada0b5db555
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely intended to lure users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the malicious destinations. No scripts were extracted, but the overall structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://isigakizima.net/img/tmp/file/fadexijamaridetagogifa.pdf In PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130f6b847e63---61882599521.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613586fad714e---59882002689.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d7b4bfb68---peburelob.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/87984245483.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/ganewezinawinesituzozud.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/97043530739.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/zabademuri.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/kivuj.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/vijosufiselumegewemi.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/26044126703.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210907115537.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090823204673499.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/42894847867.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/favonijev.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/rebazezufira.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/20654782126139c3e402737.pdfIn PDF document text
    • https://renteci.com/imagens/file/38536452109.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/zatefovolivuze.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/xepepije.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kfi4903eb3r48oprqkdf2ls1v6/37034267462.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/50391865535.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/wanuvefirulilasixuper.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/55884418411.pdfIn PDF document text
    • http://kme-kme.cz/files/file/68873802647.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/48525028936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=pythagorean+theorem+3d+shapesPDF 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_off0000d838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD838 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04F 10988 bytes
SHA-256: 4909cfbb5810d4fc2d4fdb049fdb7aaa7776bfb7dcc19c81372e2d5b410e643b
font_02_sfnt_off00010983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10983 20084 bytes
SHA-256: e9b8b8159b90875e336aa68b0b716dce28c3fbfd5d8ebaff8ea0a275b6d1006c

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