Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ac91bc150e704e…

MALICIOUS

PDF

86.3 KB Created: 2021-09-20 05:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c272006fc8c12e6027c69ac8fd79f8a2 SHA-1: bdca820b942311511ce4fb1a4fcbd702cef3ac9a SHA-256: a7ac91bc150e704e1f084c49c2f246fd057b65b0580d30b9a23ddd4c4621b54a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common technique for distributing phishing lures or malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous unknown URLs suggests a broad distribution effort, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1612f14aa1fe99---vekijomarejanebode.pdf In PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d5e59e319---memabakilexejixetaluke.pdfIn PDF document text
    • https://shidoremicrosys.com/media/lisexa.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/19436688846.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613396db72eac---33359405314.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/nagebaxokesukelalege.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/popozepulizi.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/817991920.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/wuvixokimozebunorofesi.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/gevubamupuroxatog.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/73763532974.pdfIn PDF document text
    • https://lapakunited.com/contents/files/tezoxipubufiro.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/75935444708.pdfIn PDF document text
    • http://reopen911.info/media/file/xerukawuk.pdfIn PDF document text
    • https://emmaushuis.org/pages/13794161654.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/57623288639.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/mitizine.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/9652489299.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161431abd50d66---19027797649.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/rixunepi.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e339c3f0f---41295819924.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/rotabapapujeweko.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/ganabopokidudonika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=adb+shell+settings+get+secure+android_idPDF link annotation
    • https://b2cdemo.tickets.com/content/files/dajifikikevinobobuwefosut.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC56D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD84 10900 bytes
SHA-256: 669c6e293c6b38c62a0dd718c807eefb8022ca32de17ca8a22c93dc2d920c605
font_02_sfnt_off0000f680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF680 23612 bytes
SHA-256: 4f53113ba2a565051a7eb329581cf3b0739801d9a95ce50872f97235328aaddd
font_03_sfnt_off00013341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13341 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684

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