Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebbc6623e8132805…

MALICIOUS

PDF

81.1 KB Created: 2021-09-09 18:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b9959efa36b2f6d5ebdd780f2b592ef5 SHA-1: 1dc829642b460d0b17a650d854c655ba55406358 SHA-256: ebbc6623e813280580868b84406abcd72026caac027bd9f5ad03916460a28c47
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing malware. The presence of a compromised CMS upload link further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://telegid.tv/userfiles/file/paxeloxejagunipiforumapop.pdf In PDF document text
    • http://ampletrekking.com/userfiles/file/muporamorovelonifobakatuw.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/22650889842.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/7303658975.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/69821723804.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/piwemaxeti.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/wojagar.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/witeginuvanamegumaze.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202196_21155_810.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136aaf488d82---sifuzogopo.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371a57179c3---nakizur.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/21145623492.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/rebore.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/lubake.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/6352910343.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/jejanajofepuzegotu.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/uof176crp8ljs6s2hbqausqrf8/72840781312.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/78034534710.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612eab4867397---38428616256.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/pazugizedagika.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109021052142736.pdfIn PDF document text
    • https://j26clean.com/upload/files/81393635310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=adobe+photoshop+cc+2019+crack+amtlib+dll+64+bit+downloadPDF 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_off0000d551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD551 11788 bytes
SHA-256: 3f5ed3f4a475ac0cbc6a1b040ce1bf2fa6aba74e24f1df801c4933bab8f1de2d
font_01_sfnt_off0000f135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF135 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10947 17620 bytes
SHA-256: 94ed99f0813a14d0dd5c099c6d3700238956cc25f7d1d5e1d5d7e1f9fb6df001