Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93185d779d5c0ec…

MALICIOUS

PDF

81.4 KB Created: 2021-09-14 20:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 016395faf3336f4d2df11642adb1539c SHA-1: 77bc4ea31c891178f9df4c53ed7941a26489c699 SHA-256: a93185d779d5c0ecc0b3c094f6662be464396cf64d1e8b814f314510c603de35
196 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on disposable domains, a common tactic for phishing and malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a method used to evade gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the exploitation of a PDF vulnerability to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/lasuluvukovajomowoto.pdf In PDF document text
    • https://tainandentist.com/uploads/files/202109030245327552.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/82763222091.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/s1bp4g0c1qjvp0amiqg2pco9pi/88130946558.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/93675463252.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140aecbbcbcf---28662946780.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/6290537860.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/51659398690.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/saludewez.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/92490908068.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/1925619095.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/53526454413.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lalosifup.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/88854727032.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/92341159623.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/giduxitejajoboxedosu.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109052114436653.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/34047498148.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/33edf77969edb26a14ee5ed658b6db52/57615826115.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/72240882297.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/beruzanulujuxulogeta.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210906110118.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/12489519910.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/70878964028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=pdf+password+remover+androidPDF 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_off0000dc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC15 10668 bytes
SHA-256: 777c226ea5dcfeb40d62ad6731c231b85ea1f72f37b886c4eba05e3a1dcf03c6
font_01_sfnt_off0000f493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF493 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA5 16640 bytes
SHA-256: d5881393811ec1c8baa20917ec722bc05e2582814e9b9405675456481499a01f

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