Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f7ac57cdd28883…

MALICIOUS

PDF

74.9 KB Created: 2021-06-25 19:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2effb02417438c2dd67e39f85acb83ba SHA-1: 6a4a40e83426a4361e1f953dd3ed37778ee96c25 SHA-256: 98f7ac57cdd28883aee00bbe42e6137c5d199e8956a8a9a39b6f3c63e5bba924
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a phishing or redirection scheme. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://traveletrust.com/basefile/traveletrustcom/files/jotoviliredogeniwe.pdf In PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/lasaguxufavunosiwemewu.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ipuwukufozib.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/valuwazoralazogugenoja.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/b0a64e28d0e42c1af6a4443faf4ec595/buxamalemaw.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/fb2ee46b219cc2f272a23e0a5a0350ea/53629766192.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab92b6190d---80772180216.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/premd42mmj8eakh2ko1nbhrth3/xubuxovufig.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03b9c47a9d---liromaso.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/1lodd71dulh97uuibrm6jrv7s6/76586337937.pdfIn PDF document text
    • http://greenbrier101.com/userimages/tejaxawiveluxisex.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/45662380749.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/141c82fae088ea9f4206d59fc30a9793/3653163029.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/jolixegojexibufekujowu.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/ec62c86a5f3351323bbcb3765f3e2854/15859715760.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/9np0534neel4a6c9glv3iqp1kp/49364328907.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/27035926000.pdfIn PDF document text
    • http://sns.hu/_user/file/34209598775.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/89937000677.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/0dc2c63fce4d2d5b6b22ff8725f299a5/nuritowefuleg.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/nofeneduneri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+great+is+our+god+ukulele+chords+easyPDF 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_off0000be64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE64 10928 bytes
SHA-256: 0414b8816f94ce1de10dffb370d2fd7ba26fc4c20b0dfbb66e31f16cdb906e82
font_01_sfnt_off0000d7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCB 17080 bytes
SHA-256: e26e954b90e47b88801250b8c47fa2cd56243804f20915ca65ec0512ead1a64b

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