Malicious PDF — malware analysis report

Static analysis result for SHA-256 2208b29b0213bb30…

MALICIOUS

PDF

83.9 KB Created: 2021-09-13 05:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: db5c2c184fdac0f87757bd5f0463c94e SHA-1: 4cbce7e2076d34a54f216068357502bef5c2e2a8 SHA-256: 2208b29b0213bb30b96fca5411ee37a3a819912e8aa06504ecc546161aca3001
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phishing lures. The presence of many unknown reputation URLs further supports this. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302ec048164---disajizapuguxesawububi.pdf In PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/gorizuwogidakatezud.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/44335336716.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/27464680030.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021090601004773499.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/17785083958.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/tunidisexubazamutexozaxo.pdfIn PDF document text
    • http://co-mit.com/uploads/files/68467549213.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/zudutuximemudemifetir.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134c380275d0---woduxinuzulazolifem.pdfIn PDF document text
    • http://landia-print.com/pdir/file/69139344313.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/9798035796.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/kiroruwofofexodul.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/55532594037.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/24211635703.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/99026623564.pdfIn PDF document text
    • http://sapthagireesyathra.com/userfiles/file/13003813697.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109120650335819.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/4436776b63db5c1fc89538c4a8fa4f99/65442233771.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/xojeneradivomoxodunesife.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ece829b80a---rosutujoburulibofatosa.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/zomolesoko.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/93467840367.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=android+file+transfer+could+not+copy+filePDF 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_off0000e37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37B 17284 bytes
SHA-256: 2e17d1f77f64cd55b1ebbd747af05d305fe31856868cd3e96ba03b22d8f9ff4f
font_01_sfnt_off0001102d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102D 10808 bytes
SHA-256: 7f96c41d6c1e1aa94a3ecc42977701cf709ea59361ee87dccdad65bd5a199af5
font_02_sfnt_off00012941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12941 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1