Malicious PDF — malware analysis report

Static analysis result for SHA-256 30f737b077ebaed7…

MALICIOUS

PDF

100.4 KB Created: 2021-08-13 20:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 55f66d946debbd8fa7e2204751a512ad SHA-1: 675062d988ba53873f1e6940d6e75e9cf174fb9e SHA-256: 30f737b077ebaed7bf749600c2860dba9857f50f127b23f954be39dc5ec3e45a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads or disposable domains. The document body is unreadable, but the overall structure and heuristic firings suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

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://abeess.com/userfiles/file/perugiduwafapopolovukewo.pdf In PDF document text
    • http://sun-eko.eu/files/file/dusefoguripozetokuke.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/66412656614.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20217161944243967.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af6c121489f---derimamosikamireluw.pdfIn PDF document text
    • http://mcutech.net/upload/2021/07/file/16277320101182538458.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/lotesokanobivufelifobakuj.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/39090470153.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/fulozemipowasesukasif.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6aeaa67333---varaja.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/e989224702b54dc6951b72c3b40ccddb/81844866941.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/xewewisibi.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/jarebapejaxex.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/4aa4e0c5510fabf6e513dc0db41bc4ee/55814163831.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/513aee1efbfbb70028ffed12e818553c/fimalavipexejelonitoju.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/giriwowofifim.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/79780578264.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb9ae4324a---ridorawebunege.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/gabirimi.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/83943554141.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/suvesunemisamugud.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/21821275698.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/dc73f014385ea7b2d58838054c243eac/mewale.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/79794725436.pdfIn PDF document text
    • http://irths.com/upload_files/files/88394113569.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16072cd3b5412a---88860832215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+does+day+trading+cryptocurrency+workPDF 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_off00012392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA4 17312 bytes
SHA-256: 1e3ecf4db595379fbfbba58829374b14e40daa65143435ce6bb832939fd3480e
font_02_sfnt_off00016899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16899 11024 bytes
SHA-256: 3c5de839e6c33340f34a1df7a8b5eba243b128f43ff6d286a6c3311dd505f977

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